Yes , I believe it is
According to Horace Kallen , Cultural pluralism refers to a society that contains a lot of different ethnics, but each ethnics still try to maintain their identity.
The U.S society in 1920s indeed consist of several group with different ethnicity due to the large number of immigrants that came in. But each groups tend to form their own communities in separate area rather than assimilate. This maintain the difference in their ethnic diversity.
Some of the effects were 1 new plants were discovered
2 most of the native americans were killed
3 the lands were renamed
They were fleeing crop failure in their homes and land an job shortages and tax raising
Choice A is wrong because only 26 presidents have served in the military.
Choice B is wrong because not all presidents have been governors.
Choice D is wrong since James Buchanan and Grover Cleveland were not married.
Therefore, Choice C is the correct answer.
I believe it would be false