Why did North American planters increasingly rely on slave labor rather than indentured servitude?

Many landowners also felt threatened by newly freed servants demand for land. The colonial elite realized the problems of indentured servitude. Landowners turned to African slaves as a more profitable and ever-renewable source of labor and the shift from indentured servants to racial slavery had begun.

Explanation:

Indentured servitude differed from slavery in that it was a form of debt bondage, meaning it was an agreed upon term of unpaid labor that usually paid off the costs of the servant's immigration to America. Indentured servants were not paid wages but they were generally housed, clothed, and fed.

c. as a force against soviet invasion of afghanistan

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.