What were collcas? warehouses where surplus crops were stored
groups of families ruled by nobles
well-built roads that allowed the military to move quickly
labor taxes collected from conquered people

a

explanation:

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration

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.

our current president donald trump