Why was the nation's new capital established on the Potomac River between Maryland and Virginia? pleases i need to get this right

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.

it granted civil rights to african americans.