War is often discussed through treaties, campaigns, and dates, but underneath those formal layers it is still a struggle over land, resources, routes, and survival. Sometimes it is also a brutal lesson in what happens when a country lacks the strength to decide its own fate. The Russo-Japanese War, the Mexican-American War, and the collapse of France in 1940 all reveal different sides of that same reality.
The Russo-Japanese War: a war fought on Chinese soil over Chinese interests
In July 1900, Russia took advantage of the intervention against the Boxer uprising and sent troops to occupy the three northeastern provinces of China. In April 1902, China and Russia signed the treaty on the return of the three eastern provinces. Yet after Russia carried out its first troop withdrawal in October of that year, it refused to continue honoring the agreement. This immediately drew opposition not only from Japan, but also from Britain and the United States.
On August 12, 1903, Japan formally opened negotiations with Russia. Japan demanded that Russia recognize Japan’s “superior interests” in Korea, while Japan in turn would acknowledge only Russia’s “special interests” in the railways of Manchuria. The talks went nowhere.
On February 6, 1904, Japan notified Russia that negotiations were over and broke off diplomatic relations. Two days later, before any formal declaration of war, the Japanese navy launched a surprise attack on the Russian fleet stationed at Lüshunkou in China. The Russo-Japanese War had begun.
On February 12, the Qing government declared neutrality, arguing that both Russia and Japan were “friendly states.” In reality, hundreds of thousands of Russian and Japanese troops were fighting on Chinese territory over control tied directly to Chinese land and rights. Neutrality in such a situation was less a choice made from strength than a sign of how little room China had left to act.
Russia suffered repeated defeats, weakened by supply problems and poor command. In May, Japanese forces occupied Dalian. In January 1905, Port Arthur fell. In March, Japan seized Mukden, today’s Shenyang. In May, the Japanese navy crushed the Russian Baltic Fleet, which had been sent from Europe as reinforcement, in the Battle of Tsushima.
After the disaster at Tsushima and the outbreak of revolution at home, Russia had no real chance left to win. The United States then stepped in to mediate. On August 10, peace talks formally opened in Portsmouth, and on September 5, 1905, the two sides signed the Treaty of Portsmouth.
The consequences went far beyond the battlefield. Japan’s victory laid an important foundation for its later expansion into China and for its bid to dominate East Asia. It also made Britain and the United States more wary of Japanese power. For China, the war was not only a brutal violation of sovereignty, but a catastrophe for the people of the Northeast, who bore immense suffering while foreign armies fought over their homeland.
There is a bitter irony here. If a country is too weak, even being forced into humiliating treaties can begin to look like a lesser disaster compared with complete destruction. China’s attempts to use one foreign power against another were, in that sense, the policy of a state with very limited options. Power set the boundaries of diplomacy.
At the same time, war repeatedly shows how closely military competition and economic competition are tied together. A navy is not built from courage alone. Industry, credit, foreign procurement, and finance all matter. Japan’s war effort depended not just on soldiers and ships, but also on the economic means to sustain them.
The Mexican-American War: territorial expansion backed by force
The Mexican-American War was fought from 1846 to 1848 between the United States and Mexico over control of territory. It was one of the key wars through which the United States expanded its landmass.
One important background factor was Texas. American settlers moved into the region, and after a period of political change Texas became independent as the Republic of Texas before gradually entering the United States. That pattern—migration, separation, then annexation—has often been noticed as a recurring logic in territorial politics.
American ambitions toward California and access to the Pacific had existed for a long time. In 1835, President Jackson tried to buy San Francisco Bay and the territory north of it for $550,000. In November 1845, President Polk attempted to use Mexico’s alleged obligation to repay a $300,000 debt to the United States as leverage to obtain New Mexico and California. Mexico rejected the demand.
On January 13, 1846, Polk ordered Zachary Taylor to cross the Nueces River and occupy the left bank of the Rio Grande, territory that had never belonged to Texas. War followed.
Militarily, the United States largely overwhelmed Mexico and pushed all the way into Mexico City. But even in an apparently one-sided campaign, urban occupation and guerrilla resistance remained dangerous. More than a thousand Americans died in connection with the entry into the Mexican capital, and many casualties in the war also came indirectly through infection after wounds. When the main force cannot be beaten in open battle, guerrilla warfare becomes the desperate method left to the weaker side.
The usual story of U.S. expansion emphasizes purchases of territory from older empires, often portraying them as shrewd and peaceful deals. But the line between purchase and coercion can be thin. Sometimes payment serves as a polite outer covering for a relationship defined in the end by military power. Strong states do not rely on contracts alone; the gun is always present in the background, even when the transaction looks civilized.
France in 1940: alliance, calculation, and the problem of military assets
The collapse of France in 1940 offers another angle on war: even among allies, interests do not disappear.
Germany bypassed the Maginot Line, France collapsed, and the armistice was signed in the same railway carriage associated with Germany’s defeat in the First World War. The symbolism mattered. Victors like to reverse humiliation as much as they like to seize territory.
A major question then arose over the French fleet. Britain repeatedly pressed for solutions that would keep those warships from falling into German hands: integration into the British fleet, transfer to American custody, scuttling, or continued resistance against Germany. The French side did not accept these options. Britain ultimately chose force.
From the British perspective, this was harsh but strategic. A powerful French fleet under German control would have become a serious weapon. Churchill’s decision was applauded in the House of Commons because it signaled uncompromising determination to continue the war against Germany.
There is something similar here to earlier East Asian naval history: when defeat becomes unavoidable, scuttling one’s own ships may still be judged more honorable—and more practical—than allowing them to be absorbed by the enemy. If captured intact, ships become the opponent’s strength, and replacing them may be impossible.
The larger point is that alliances never erase calculation. Every state keeps its own ledger. Public declarations may speak the language of friendship, but in war the arithmetic of survival, resources, and advantage remains brutally clear.
War, technology, and the pressure to develop
These cases also point to another uncomfortable idea: war is one of the forces that drives technological and organizational development. A country threatened by repeated conflict, scarcity, or external pressure may develop a stronger internal push toward military and industrial modernization. Japan’s rise was shaped by exactly this kind of pressure.
That does not make war noble. It only shows that competition in economics and competition in arms are often inseparable. Military strength requires industrial capacity, finance, transport, and administration. Economic rivalry is not separate from war; it is part of the machinery that makes war possible.
War can look uncivilized, but it is often highly organized competition carried out with modern tools. Behind every battlefield lies a struggle over production, money, logistics, and political will.
And across these very different examples, one fact keeps returning: the side that cannot protect its territory, its fleet, or its borders will eventually find others making those decisions for it.