Twentieth-century conflicts such as World War I and World War II were often followed by periods of even more fighting because they:
A. convinced citizens that their countries should become more
isolated.
B. failed to resolve key issues and created resentments between
countries.
C. led world leaders to abandon the political philosophy of
nationalism.
D. helped powerful countries seize control over huge colonial
empires.
SUBMIT

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.

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explanation: i just want to

4 copper and gold, the california gold rush is why im pretty sure.