1980 was the time at the end (but people didn't know that) of the Cold War, that is the conflict between Capitalism and Communism,
US had a capitalist system and was actively involved in stopping the spread of Communism in Asia and Latin America and this is also the correct answer: stopping the spread of Communism.
a justice system in the awnswer
The case changed the Georgia flag because the case was an attempt to end segregation in schools, but Georgia officials wanted to keep segregation and strengthen JC Laws. The GA flag was made to show resistance to integration, after the case was settled they had to change it.