This system of government has powers divided between the central government and regional governments, with central government being supreme.

The correct answer is Federalism.

Under a Federalist system, power has divided between a Central government and regional/State governments.

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.