the US is a federal republic and a constitutional representative democracy
The United States' role in world affairs was very limited
WWI was caused by many things, among them was the assassination of Franz Ferdinand leading to the Austria-Hungary empire declaring war on Serbia which dragged most of Europe into the war due to alliances. The U.S. entered the war due to Germanys war tactics and the Zimmermann note.
During this era southerners were against letting slaves be free and many problems and disagreements came with this.
The correct answer to number 1 is A) the start of the Cold War.
The start of the Cold War was a result of increased political, economic, and military tensions between the United States and the Soviet Union. These tensions were caused by the difference in economic and political systems of the two countries, with the US disliking the system of communism used by the Soviet Union. This is when the fear of communism, aka the second Red Scare, really started to grow in the United States.
The correct answer to number 2 is C) government and security.
One of McCarthy's most famous speeches was given in West Virginia in the early 1950's in which he claimed, through his research, that he had found 207 members of the State Department were communism. This research was said to have been conducted during the 1940's.
The correct answer to number A) A wave of isolationist sentiment.
After both World Wars, Americans were focused on having their life return to normal since millions of men were now home and looking to start families.