The Preamble is the "Opening statement to the United States Constitution." The preamble explains the reasons why the Framers of the Constitution made our government a republic. By doing this, the founding fathers replaced the Articles of Confederation.
By the time that the United States entered World War II in December of 1941, Americans had no question about who to blame for it. World War II had been caused by Adolf Hitler's Nazi Germany and Emperor Hirohito's Japan, with Mussolini's Italy aiding and abetting the campaign against freedom. However, these opinions weren't always as firmly held. When the war first began in 1939, not all Americans agreed on where to lay the blame.
It established the United States as a major power in the Western Hemisphere.
Answer:
Agriculture turned humans from hunter gatherers into a more organized and civilized species. Because of people settling down to farm, citites were born because more people collected themselves around their main source of food. This also introduced the "division of labor" aspect of human evolution. Different families, now living in communites, could each be in charge of a specific task to help further their survival. Instead of each family having to do everything for themselves (churning butter, making clothes, building houses, etc.) one family would take on one of these tasks and produce their trade for the whole community and barter with the rest of the community for what they still needed. This led to the creation of jobs, money, and basically all of the social and economical commerce we know today.