Why did supporters of manifest destiny argue that us expansionism was not imperialism? the united states already had interests in its expansion areas. the united states had no plans to overthrow existing governments. the united states believed expansion would benefit other countries, not exploit them. the united states believed it deserved more territory as a democratic, christian nation.

The United States believed expansion would benefit other countries, not exploit them.

This can be found through the process of elimination:

The first choice, The United States already had interests in its expansion area's, is incorrect as it technically doesn't apply to Manifest Destiny and also was not used to defend it.

The United States had no plan to overthrow governments; the area west of the east coast was divided between some nations such as Mexico and France, but no governments were involved in arguments.

The last choice is incorrect as the nation wasn't fully Christian, rather it was still fairly diverse.

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