The problem that Lincoln saw with the Emancipation Proclamation was that it could potentially be reversed after
the end of the Civil War, if leaders viewed it as only a wartime
measure. How did Lincoln attempt to solve this problem?

the answer to this question is the third option. hope this

warfare was the primary means of cultural transmission in both regions.

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.