The most violent political change in eastern europe took place in 1989 with the revolutionary overthrow and execution of nicolae ceausescu of a. albania b. east germany c. poland d. romania

i believe the answer is a

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.