On a bar graph, the title identifies this, between each of the 2 labeled variables?

What was the name of the theory that said that if one country in a region fell to communism, others would surely follow? 1) domino theory 2) arms race 3) brinkmanship 4) containment theory

The war powers act, passed in 1973, was a measure by congress intended to?

Which is the most negative effect resulting from citizens relying on the internet as their only source of news?