The size and sophistication of native american civilizations in mexico and south america can be attributed to

a. spanish influences.

b. influences brought by early settlers from siberia.

c. their way of life based on hunting and gathering.

d. the development of agriculture.

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.

currancy

explanation: