What signifies the period known as prehistory? a. language was fully evolved. b. writing was very elementary. c. there was no form of writing. d. records were hidden away.

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.

during the ming dynasty