An event that changes things significantly. For example, during a war, if one side is winning then all of the sudden loses power that would be a turning point.
Eisenhower's domino theory was based off the idea that, "if one country falls to communism, they will all fall"
D. an investigation All of the others have an order to them
February 7, 1998 - February 22, 1998
February 12, 2010 - February 28, 2010
February 7, 2014 - February 23, 2014
February 9, 2018 - February 25, 2018