America modeled its Constitution on which country’s form of government?

Switzerland

In 1847 and 1848 a wave of democratic revolutions swept through Europe. A brief civil war in Switzerland resulted in a new constitution modeled after the United States Constitution, which transformed the government of Switzerland from an alliance of republics to a federal nation.

Explanation:

a case involving the laws of a single state.

warfare was the primary means of cultural transmission in both regions.