"secure the blessings of liberty" hope this helps
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 dependent variable is something you control, so probably drugs (as the researcher will ensure that they stay drug free)
The answer is b that it is B
