Zaibatsu
The family-controlled industrial empires, Mitsubishi, Mitsui, Sumitomo, Yasuda, that powered Japan's rise and war machine before America broke them up in 1945.
By the time Japan went to war in the Pacific, four family firms controlled a startling share of its economy. The zaibatsu, literally 'financial cliques,' were sprawling combines that spanned banking, shipping, mining, trading, and heavy industry, each answering ultimately to a single founding family. Mitsui, Mitsubishi, Sumitomo, and Yasuda, the Big Four, were the closest thing the modern world has seen to privately owned national economies.
Built with the state
Two of the houses were old. Mitsui traced its fortune to a seventeenth-century dry-goods and moneylending business in Edo; Sumitomo grew from copper mining and finance of similar vintage. The other two were creatures of the Meiji Restoration of 1868, when a modernizing government that had just swept away the Tokugawa shogunate set out to build an industrial economy fast. Mitsubishi was founded in 1870 by Iwasaki Yataro, a former samurai who won government shipping contracts and parlayed them into a shipbuilding, mining, and banking empire. When the cash-strapped state sold off its model factories and mines in the 1880s, it sold them cheaply to these trusted concerns. At the heart of each combine sat a bank, funneling the family's capital into whatever industry promised growth, an arrangement that let the zaibatsu move faster than rivals and starve them of credit. The result was a partnership: the zaibatsu got assets and monopolies, and the government got the industrial base a great power required.
War and dissolution
That partnership deepened as Japan turned militarist and expansionist. The zaibatsu financed and supplied the armed forces, built the ships, aircraft, and munitions of empire, and profited from the conquest of Korea, Manchuria, and beyond. By the 1920s just three of them, Mitsui, Mitsubishi, and Sumitomo, controlled roughly a quarter of the assets of Japan's hundred largest companies. By 1945 the same families still controlled, through pyramids of holding companies, close to a quarter of the assets of all Japanese corporations. When the United States occupied a defeated Japan in 1945, reformers blamed the zaibatsu for underwriting the war and moved to break them up, ordering the dissolution of hundreds of companies and passing an antimonopoly law in 1947.
The afterlife
The breakup was real but incomplete. As the Cold War hardened and Washington shifted from punishing Japan to rebuilding it as an ally, enforcement eased. The old combines regrouped, not as family empires but as looser networks called keiretsu: clusters of firms bound by cross-shareholdings and a shared main bank rather than a controlling clan. The names endured. For decades these groups formed the backbone of the postwar 'Japan Inc.' that stunned the world with its growth. Mitsubishi, Mitsui, and Sumitomo still head some of the largest business groups on earth, a reminder that the industrial architecture the Meiji state built, and the Americans tried to demolish, proved far more durable than the empire it once armed.