This question refers to the following quotation."The year of the massacre at Wounded Knee, 1890, it was officially declared by the Bureau of the Census that the internal frontier was closed. The profit system, with its natural tendency for expansion, had already begun to look overseas. The severe depression that began in 1893 strengthened an idea developing with the political and financial elite of the country: that overseas markets for American goods might relieve the problem of underconsumption at home and prevent the economic crises that in the 1890s brought class war."Howard Zinn, "A People's History of the United States, 1492-Present," 1995Howard Zinn, A People's History of the United States (New York: Harper Perennial, 1995), 290.What factor most influenced "the tendency for expansion" noted in Zinn's passage above?

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