Answer:
Democrats vs. Republicans - P
This represents a political conflict because the Democrats and the Republicans are the two main political parties of the United States.
the Cold War - P
The Cold War was mainly a political conflict between the two world superpowers at the time: the Soviet Union and the United States. However, it was also an economic and ideological conflict, between capitalism and communism.
Protestants vs. Roman Catholics - R
This is a religious conflict because they are both religious denominations within Christianity, a major world religion.
isolationism vs. internationalism - I
This is an ideological conflict. Isolationism and Internationalism are two opposing ideologies about the way that nations should relate with other states in the global stage.
the Crusades - R
The Crusades was mainly a religious conflict, between European Christianity, and Middle Eastern Islam. However, it was also a political and economic conflict.
free trade vs. trade barriers - E
This is an economic conflict because two opposing economic views about trade are being challenged.
colonialism vs. nationalism - I
This is an ideological conflict. Colonialism and nationalism are two ideologies that can be in conflict with each other, although they were often allied ideologies in real history.
The idea that O'Sullivan describes in this quotation is A) manifest destiny. Manifest Destiny was an idea that O'Sullivan was responsible for popularizing in the 1800s. This political theory or ideology sought for the United States to expand its borders to the Pacific Coast based upon a god given right to expansion which he called Manifest Destiny.
To deter Americans from the ideology of communism that was becoming more widespread throughout Europe and Asia
