The Mirror of History: The U.S.–Iran War and the Second Choshu Expedition

⚠️ This article is a speculative analysis based on the Triple Cycle Theory. It does not predict or guarantee the occurrence of any specific events.

Prologue: Why “The Choshu Expedition”? — The Starting Point of Comparison

History does not repeat itself. But structure does.

In the course of the Triple Cycle Analysis, one question emerged: how can the military confrontation between the United States and Iran — which has been becoming reality since 2025 — be read through the lens of cycle theory?

The most effective “mirror of history” for answering this question is the Second Choshu Expedition of 1866. For readers unfamiliar with Japanese history, a brief orientation follows.

Historical Background: Japan in 1866

In 1866, Japan was ruled by the Tokugawa Shogunate — a military government that had governed the country for over 260 years (since 1603). The Shogunate was not an emperor’s government; it was a feudal administration run by a hereditary military commander (the Shogun), while the Emperor remained a ceremonial figure in Kyoto, largely removed from political power.

Japan was divided into roughly 260 semi-autonomous domains (han), each governed by a feudal lord (daimyo). These lords owed nominal loyalty to the Shogunate, but in practice, the most powerful domains acted with considerable independence.

By the 1850s, the Shogunate’s authority was crumbling. The arrival of American Commodore Matthew Perry’s “Black Ships” in 1853 — demanding Japan open its ports to foreign trade — exposed the Shogunate’s inability to defend the country. The forced opening of Japan ignited a political firestorm. Two factions emerged:

The Shogunate faction: sought to modernize gradually while maintaining the existing power structure.

The “Sonnō Jōi” (Revere the Emperor, Expel the Barbarians) faction: demanded the overthrow of the Shogunate and the restoration of imperial rule, centered in the powerful southwestern domains of Satsuma and Choshu.

Choshu domain (present-day western Yamaguchi Prefecture) was the most radical anti-Shogunate force. In 1864, Choshu troops had attacked the Imperial Palace in Kyoto in a failed coup attempt, and the Shogunate declared it an “enemy of the Emperor” — an extreme condemnation in Japan’s political culture.

The First Choshu Expedition (1864) forced Choshu to submit. But Choshu quickly rearmed, secretly allied with Satsuma, and defied the Shogunate again. The Second Choshu Expedition (1866) was the Shogunate’s attempt to crush this defiance once and for all — deploying a massive military coalition against a single domain.

The Shogunate lost. Badly. This defeat effectively ended its 260-year rule. Two years later, in 1868, the Meiji Restoration returned formal power to the Emperor, and Japan began its rapid modernization into a world power.

The question this article explores: why did the numerically superior Shogunate lose to a single rebellious domain — and what does that tell us about how old powers collapse?

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Why the Choshu Expedition as a mirror for 2025? There is one reason: the structure of “an old power attempting to reclaim lost legitimacy through military force” overlaps with striking precision.

Section 1: The Triple Cycle Structure of the Second Choshu Expedition

1-1 Position within the Cycle

We confirm the position of the Second Choshu Expedition (1866) within the Japan cycle (origin: 1600, Battle of Sekigahara).

Cycle	Node Year	Actual Event	Margin
55-yr Node 4	1820	Around the Siebold Incident / onset of Western impact	±a few years
83-yr Node 3	1849	Pre-stage of Perry’s arrival (final period of the seclusion system)	4 years prior
90-yr Node 3	1870	Abolition of domains (institutional completion of the Meiji Restoration)	4 years after
Choshu Expedition	1866	Final exercise of the old order / confirmation of its collapse	—

The Second Choshu Expedition falls “4 years before” the 90-year transition point (1870). In the law of the Triple Cycle, this period is when “the institutional lifespan of the old order has expired, and maximum tension arises immediately before the transition.”

1-2 The Structural Essence of the War

Viewed as a military event, the Second Choshu Expedition appears to be a reversal — “the numerically superior Shogunate army defeated by the smaller Choshu domain.” But from the perspective of the Triple Cycle, the essence is entirely different.

Why did the Shogunate lose? The answer is: loss of ideational legitimacy.

The Shogunate’s stated reason for attacking Choshu was “suppression of an enemy of the Emperor.” But by 1866, the new ideas of expelling foreigners and overthrowing the Shogunate had already spread nationally. Satsuma domain refused to participate; many other domains were passive. The ideational foundation for “obeying the Shogunate’s orders” had already collapsed before the war even began.

More important than military outcome is this paradox: “the very act of launching this war proved the Shogunate’s own end.”

★ The essence of the Second Choshu Expedition: it was not Satsuma and Choshu that toppled the Shogunate — it was the Shogunate itself. The “final exercise” proved its own termination.

Section 2: The Cycle Structure of the US–Iran War

2-1 Position as Read from Two Origins

We read the US attack on Iran (2025–2026) from two Triple Cycle origins.

Origin	Cycle	Node Year	Meaning
1776 (founding)	83-yr Node 3	2025	Confirmation of the end of “the world’s policeman” mission
1776 (founding)	90-yr Node 3	2046	Confirmation of the new American identity
1492 origin	90-yr Node 6	2032	Power-based end of the US-led international order
Islamic origin (622)	55-yr Node 1 (Ch. 6)	2027	Node at which the ideational outcome of the war is confirmed

What is critical is that this US–Iran War is occurring “immediately after” the 83-year transition (2025) was confirmed.

The 83-year transition point of 2025 marks the end of the institutional lifespan of the idea that “America is the world’s policeman, with a universal mission to protect democracy, freedom, and human rights.” America launched a unilateral military intervention in the Middle East — the “final exercise of the old mission” — immediately after that mission’s end was confirmed.

2-2 Iran’s Position within the Cycle

Iran, read from the Triple Cycle of Islamic/Middle Eastern civilization (origin: 622 Hijra), sits within the “second node cluster” of the 270-year cycle from around 1972 (the 5th transition point). The reading that the 55-year Node 1 (2027) functions as “the node at which the ideational outcome of the war is confirmed” is elaborated in the supplementary chapter on post-2028 Iran.

In short: the “final timing for America to exercise its old mission” and Iran’s “transition node toward its next form (2027)” are arriving almost simultaneously. This is not coincidence — it is the “convergence of transition periods” that the Triple Cycle reveals.

Section 3: Precise Alignment of Structural Parallels

We align the structural parallels between the Second Choshu Expedition and the US–Iran War along five axes.

Axis	Second Choshu Expedition (1866)	US–Iran War (2025–)
Position of old power	Shogunate: militarily superior but ideational legitimacy lost	US: militarily superior but “mission legitimacy” ended at 83-yr transition
Bearer of new ideas	Choshu domain: embodiment of the new ideas of imperial restoration and overthrow	Iran: symbol of the idea of “resistance to US-led order”
Position in cycle	4 years before 90-yr transition (1870)	6–7 years before 90-yr transition (2032)
Function of war	Old order uses its “final power” and proves its own collapse	Old hegemon makes its “final exercise” and accelerates its own end
Post-war structure	1867: confirmation of overthrow ideology → 1868 Meiji Restoration	2027 (55-yr node): confirmation of post-war Iran’s form → 2032 hegemonic end

3-1 The Common Structure: “Loss of Ideational Legitimacy”

The most important parallel is that both wars were “launched by an old power that was militarily superior but had already lost its ideational legitimacy.”

By 1866, the Shogunate’s system of alternate attendance, national seclusion, and domain hierarchy had already become dysfunctional. It launched the Choshu Expedition as a final assertion of authority. The non-participation and passive engagement of many domains demonstrated that the idea of “obeying the Shogunate” had already collapsed in practice.

America in 2025 shares the same structure. Immediately after the 83-year transition confirmed the end of the “world’s policeman” mission, it launched a military intervention in Iran under the guise of that mission. The domestic divisions, the varying temperatures among allies, and the international reaction all show that the idea of “American military intervention carries legitimacy” is already wavering.

★ In both wars, the legitimacy of the war had already been lost before it began — this is the greatest parallel the Triple Cycle reveals.

3-2 “Refusal to Participate” as a Structural Signal

The most decisive moment in the Second Choshu Expedition was Satsuma’s refusal to participate. When the most powerful domain publicly refused the Shogunate’s orders, it became the first public signal that “the Shogunate’s ideational authority had ended.”

In the US–Iran War, similar signals are observable. Some NATO allies withheld support; Gulf states took ambiguous positions. The erosion of the idea that “one automatically follows American military action” is manifesting as cracks in alliance structures.

This is not a military problem — it is an ideational one. When the inertia of “following the old power” disappears, what happens? Satsuma in 1866 and the allies in 2025 are showing it in the same form.

3-3 The Paradox: “The End Is Confirmed Regardless of Victory or Defeat”

The Shogunate was militarily defeated in the Second Choshu Expedition. But even if it had won, the direction of “the Shogunate ending” would not have changed — because lost ideational legitimacy cannot be recovered through military victory.

Likewise, whatever the military outcome of the US–Iran War, the end of “the era in which America intervenes unilaterally in the Middle East” will be accelerated.

If America wins: “Won but exhausted” — the cost of Middle East engagement becomes politically unjustifiable domestically, accelerating the turn toward isolationism.

If the war is prolonged or stalemated: “The supposedly strong America cannot achieve a decisive result” — the relativity of US hegemony is demonstrated to the world, accelerating multipolarity.

Both outcomes work in the direction of “the end of America’s unipolar era.” Just as the Meiji Restoration came whether or not the Shogunate won the Choshu Expedition, this war also lacks the power to stop America’s transition.

★ The military outcome is not the issue. “The fact that this war was fought proves the end of the old power” — this is the paradoxical structure common to both the Choshu Expedition and the US–Iran War.

Section 4: Differences — The Decisive Gap of “Whether a Vessel Exists”

4-1 The Problem of the “Vessel”

Japan had the “vessel” of the imperial system. Even when the “contents” — the Shogunate — collapsed, the “vessel” of the imperial institution remained. The Meiji Restoration was a transition of “replacing the contents while preserving the vessel,” which is why it could be realized at such speed (15 years).

America has no equivalent “supra-political vessel.” The “mission” (world’s policeman) was the vessel — but that mission itself is in transition. A “transition without a vessel” takes longer and involves more turbulence. As shown in the supplementary analysis, it may take more than 20 years — until 2046 — to reconstruct the vessel.

4-2 The Different Position of “the Defeated”

In the Second Choshu Expedition, there was a degree of continuity between the defeated (the Shogunate) and the new order (the Meiji government). Many former Shogunate retainers joined the Meiji government, and former domain personnel were used in local administration after the abolition of domains.

Post-war Iran faces a more complex transition. The three scenarios — secular democracy, moderate Islamic state, or military government — cannot be determined by the Triple Cycle. The cycle only shows “when the maximum gravitational pull of transition arrives.”

4-3 The Difference in “Time Scale”

The Meiji Restoration came just 2 years after the Choshu Expedition (1866 → 1868). The speed of transition was remarkably fast.

America’s transition unfolds over a longer span: 2025 (83-yr transition confirmed) → 2032 (90-yr transition / hegemonic end) → 2046 (new national identity confirmed) — a 20-year timeline.

This difference reflects the stability of each civilization’s vessel. Japan, with the ultra-stable vessel of the imperial system, transitions quickly. America, whose vessel is an ideational mission, takes time to find a new mission.

Section 5: Implications for Japan — The Analogy of “the Black Ships of the Bakumatsu Era”

5-1 The Chain of “Black Ships” and “Choshu Expedition”

The Bakumatsu transition unfolded in two stages.

Stage 1 (1853, the Black Ships): External shock exposed the limits of the old order.

Stage 2 (1866, the Choshu Expedition): The old order itself proved its own collapse through its “final exercise.”

Then Stage 3 (1868, the Meiji Restoration) arrived.

The same two-stage structure is visible in the US–Japan relationship.

Stage 1 (2025, the 83-yr transition): The confirmation of the end of America’s “world’s policeman” mission revealed “the disappearance of the foundational premise of the Japan–US alliance.”

Stage 2 (2025–2032, the Iran War): America makes the “final exercise of its old mission,” accelerating its turn toward isolationism.

Then Stage 3 — Japan’s 2038 transition point — arrives.

5-2 The Law of “the 15-Year Lag”

It took 15 years from the arrival of the Black Ships (1853) to the Meiji Restoration (1868).

From the confirmation of America’s 83-year transition (2025) to Japan’s transition point (2038) is 13 years.

This “approximately 15-year lag” is not coincidence. It is a pattern the Triple Cycle repeatedly shows as the time needed for a civilization that has received an external shock to complete the design of a new order.

★ The question for Japan: having received the American transition (the Black Ships) of 2025, can the transition of 2038 (the Meiji Restoration) be made in the “Meiji Restoration style” — voluntary and self-directed — or will it become the “GHQ style” — imposed from outside? These 15 years are decisive.

Section 6: What the Triple Cycle Shows, and What It Does Not

6-1 What the Triple Cycle Shows

① 2025 (83-yr transition): The ideational end of America’s “world’s policeman” mission was confirmed. This is irreversible.

② The US–Iran War, occurring “immediately after” this 83-year transition, functions as the “final exercise of the old mission.”

③ Regardless of military outcome, this war will accelerate America’s turn toward isolationism and strengthen the gravitational pull toward the 2032 transition (90-yr transition / hegemonic end).

④ Iran’s 2027 (55-yr node) will function as “the node at which the ideational outcome of the war is confirmed,” and the direction of “post-war Iran’s form” will begin to become visible.

⑤ For Japan, the 7 years from 2025 to 2032 are the “preparation period for the 2038 transition.” The question is whether the external shock of America’s transition can be converted into the energy for a self-directed transition.

6-2 What the Triple Cycle Does Not Show

The Triple Cycle shows “when the gravitational pull of transition is at its maximum.” But it does not show “what will happen.”

Whether America can construct a new vessel — a “reduced mission” (resolving domestic inequality, building a new energy order) — is a human choice.

Whether Iran becomes a secular democracy, a moderate Islamic state, or a military government is also a human choice.

Whether Japan’s transition takes the “Meiji Restoration style” or the “GHQ style” is also a human choice.

The cycle provides “a map of gravitational forces.” Reading that map and deciding how to move is always a human decision.

Conclusion — What “the Final Exercise” Proves

The Second Choshu Expedition and the US–Iran War. Two wars separated by era and civilization — when read through the Triple Cycle, one common structure emerges.

Old powers retain military force for a time even after losing ideational legitimacy. And while they retain it, they attempt a “final exercise.” But that very exercise proves their end to the world.

This is not a story of “the old power being evil.” The Shogunate, and America, each did their best in their respective eras. But before the “gravitational pull of transition” that the Triple Cycle reveals, structural position determines the direction of transition — beyond the good or evil of individual decisions.

The mirror of history reflects the present. The most appropriate lens for reading the US–Iran War unfolding from 2025 onward may be knowing what happened in the Choshu Expedition of 1866.

⚠️ The analyses and projections in this article are speculative considerations based on the Triple Cycle Theory and do not constitute a definitive prediction of the occurrence of any specific event.