Answer 2 through 4 please.

2. Union membership and activities fell sharply in the face of economic prosperity, a lack of leadership within the movement,

3. The main piece of progress that was made toward world peace in the 1920s was the League of Nations, which was founded in 1920 as a response to the evils of World War I. It ultimately failed to prevent another world war, however.

4. Mining companies, railroads and farms weren't doing well.

Explanation:

i believe the answer is c

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.