Which part of the US government interprets the constitution

the judicial branch

Explanation:

The U.S. Constitution establishes three separate but equal branches of government: the legislative branch (makes the law), the executive branch (enforces the law), and the judicial branch (interprets the law).

the awenser wuold be slaves

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.