Answer:
The answer is: <u><em>manifest destiny</em></u>
Explanation:
John L. O’Sullivan, Who worked as an editor of a magazine was the first one to use “manifest destiny” in 1845.
This concept stated that America has a right to expand across the whole continent so that they can become more powerful and independent.
The action that has come to symbolize the end of the Cold War is 3. tearing down the Berlin Wall. The Wall had been formed by the Soviet Union to separate East Berlin (Soviet-controlled) from West Berlin (Western-controlled). Its fall allowed Berliners (and Germans) from the Eastern half finally make their way to the Western half.
