Don’t know any of this pleaseee help me

Why did the united states shift away from the policy of isolationism after world war 2?

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

Who rejected the final compromise effort to stop the session movement?