Which country established itself as the leading power in the Americas?

Britain

Explanation:

Britain and the Thirteen Colonies After the conclusion of the Seven Years' War in 1763, Britain had emerged as the world's dominant power, but found itself mired in debt and struggling to finance the Navy and Army necessary to maintain a global empire.

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an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

rosevelt. 1973. "slaves everywhere"