Beginning in the mid-1960s, what action did the American government take as a result of their fear that the above scenario might happen

The correct answer to this open question is the following.

Unfortunately, you forgot to include the "above scenario." We do not what it is. Just you know it. In that period, during the Cold War, many things happened.

However, trying to help, we can comment on the following. One of the most important things that happened during the beginning of the mid-1960s, was the assassination of the United States President John F. Kennedy on November 22, 1966.

This event shocked America because it was a time of fear, confusion, and rumors during the Cold War. Just 20 days before, North Vietnamese President Ngo Dinh Diem had been assassinated.

The United States lived a period of fear anddoubts. Vicepresidente Lyndon B. Johnson became the President and continue to lead the nation in the Cold War years in which the US and the Soviet Union competed in the arms race, the space race, and the spread/containment of Communism around the world.

bibliography and citations to credit the sources hope this you if not my deepest of apologize ^w^

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.