Why did the nationalists and communists form an alliance?

Explanation:

The purpose of the alliance was to oppose the warlords and drive the imperialist powers out of China.

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

d) post-world war i