New Imperialism
Theories

The "accumulation theory" adopted by Karl Kautsky, John A. Hobson and popularized by Vladimir Lenin centered on the accumulation of surplus capital during and after the Industrial Revolution: restricted opportunities at home, the argument goes, drove financial interests to seek more profitable investments in less-developed lands with lower labor costs, unexploited raw materials and little competition. Hobson's analysis fails to explain colonial expansion on the part of less industrialized nations with little surplus capital, such as Italy, or the great powers of the next century—the United States and Russia—which were in fact net borrowers of foreign capital. Also, military and bureaucratic costs of occupation frequently exceeded financial returns. In Africa (exclusive of what would become the Union of South Africa in 1909) the amount of capital investment by Europeans was relatively small before and after the 1880s, and the companies involved in tropical African commerce exerted limited political influence.

The "World-Systems theory" approach of Immanuel Wallerstein sees imperialism as part of a general, gradual extension of capital investment from the "core" of the industrial countries to a less developed "periphery." Protectionism and formal empire were the major tools of "semi-peripheral," newly industrialized states, such as Germany, seeking to usurp Britain's position at the "core" of the global capitalist system.

Echoing Wallerstein's global perspective to an extent, imperial historian Bernard Porter views Britain's adoption of formal imperialism as a symptom and an effect of her relative decline in the world, and not of strength: "Stuck with outmoded physical plants and outmoded forms of business organization, now felt the less favorable effects of being the first to modernize."
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