The United States began to rise slowly from the Lincoln period. The Civil War was the second bourgeois revolution in American history. Although the number of casualties exceeded 600,000, although it caused certain economic losses, it abolished black slavery, better solved the land problem of farmers, safeguarded national unity, cleared the way for the accelerated development of American capitalism, and laid the foundation for the United States to rank among the world powers. The rise of the United States is due to two world wars. Because the United States is on the other side of the Atlantic and far from the European battlefield, the war will not cause too much loss to it. This is a geographical advantage; During the war, the United States sold military weapons to the participating countries and made a lot of money; After the war (mainly during World War II), the United States helped the defeated countries, such as helping Germany, lending money to Germany, restoring the German economy, and making the United States earn again. In fact, the war has caused different degrees of losses to both the victorious country and the defeated country, and only the United States has earned it. In 1930s, although Roosevelt's New Deal made the country suffer from economic crisis, it realized macro-control of the national economy and played a positive role in economic development. In fact, there are other reasons for the rise of the United States, so I won't list them one by one.