Question

which constitutional principle prohibits an individual state from declaring war?
limited government
federalism
balances
popular sovereignty

Explanation:

Federalism is a system where power is divided between a central government and regional governments (states). In the context of the United States Constitution, federalism reserves certain powers to the federal government, such as the power to declare war. This means individual states cannot declare war as that power is given to the federal level under the principle of federalism. Limited government refers to restrictions on government power in general (not specifically about the division of power between federal and state regarding war - declaring). Balances (like checks and balances) is about the separation of powers among branches of the federal government (legislative, executive, judicial). Popular sovereignty is about the authority of the government coming from the people.

Answer:

federalism