How does the system work between the states and the central government

Federalism describes the system of shared governance between national and state governments. The states and the federal government have both exclusive and concurrent powers, which help to explain the negotiation over the balance of power between them

Explanation:

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.