What clause allows the President to send in troops in order to make a state follow a federal law?

This is the only court in witch one state may sue another

The largest lake in south america is lake titicaca?

What was the national government’s biggest concern if facing a war, under the articles of confederation? the national government had no national military. the country had grown too large to defend with a small army. the states would not back the federal government. there was no way the states would pay for fighting a war.