The Truman Doctrine basically said that America would provide help even military help to any country that was under threat of being taken over by communism. By contrast, the Marshall Plan provided aid in the form of food and money to countries in Western Europe whether they were being threatened by communism or not.
New Orleans was significant during the Civil War, because the city was divided. The northern part was controlled by the Union Army, but the southern part was still Confederate so they were spared from the Emancipation Proclamation. Many cities in the South were destroyed, but New Orleans was largely spared. Many African-American troops fought for the North and most of New Orleans was captured and controlled by the Union Army early on in the war.
