The latter did offer exorbitant profits, but only with solution to problem of labor. Although capitalism is associated with free labor, it did not begin that way but rather developed that way. It was basis of Greek economy, and built up Roman. Williams says depends on time, place, labor and soil. Slavery adopted where no choice of free labor existed.
Expansion is a necessity of slave societies.
World-systems theory incorporates an understanding of the importance of segmenting labor . Initially by religion. By national origin the Native Americans were without rights to property By race. Class formed by nation, ethnicity, politics. Welsh and Irish versus English.