Amending
The U.S. Constitution governs the relationship that the state and federal government has. The federal government can impose regulations for state governments to follow. Local governments often establish laws that only their boundaries adhere to.
The United States government is considered a federal system because the central government shares powers with the states.
The power to coin money.
Citizens are the souce of political sovereignty - Apex :)
It can make decision making more efficient.
JUST DID IT ON APEX
Citizens in a democracy can either directly or indirectly influence the government, while citizens in a republic can only indirectly influence government through elected officials.
The federal government was able to collect taxes.
Ancient Greece was more committed to democratic ideals - apaex
Recognizing the need for compromise on political issues
The necessary and proper clause
(I think don't quote me-)
The Federal government has taken a more active role in areas once controlled by the states
Expert from Federalist No.14-They distrusted the idea of giving the federal government too much decision-making power.