Lincoln was worried about Kentucky, Missouri, Maryland, and Delaware because they were all border states during the civil war. He was worried that they would transform into complete slave states. If they did, the north wouldn’t have much more land and the north would have lost the civil war. He wanted to contain them.
The Warsaw Pact sought to reinforce communist dominance in Eastern Europe. The Soviet Union formed this alliance as a counterbalance to the North Atlantic Treaty Organization (NATO)
The Mayans lived in what we now call Mexico and South America.