Answer: Manifest Destiny, a phrase coined in 1845, is the idea that the United States is destined—by God, its advocates believed—to expand its dominion and spread democracy and capitalism across the entire North American continent.
Explanation: I learned about this in my 8th grade year and right now in my 10th grade year of HS. I hope this helps.
Truman implemented this in response to two threats one being a communist-led uprising against the government in Greece and two being Soviet demands for some control of Turkey's Dardanelles. It was implemented in Berlin when Truman ordered U.S. planes to fly supplies to the people of West Berlin in response to the Soviet Union's 11 month blockade on Berlin.. or something among those lines
D they surprised the Persians by crossing the Aegean Sea to attack
The Mississippi was used for transportation and their were ports along it before the LA purchase