Which of the following was a reason that the US Senate refused to let the United States join the League of Nations?
They feared trade disputes with Britain and France.
They worried about having to take part in future wars.
They wanted to allow Germany to balance French power in Europe.
They hoped to take over Europe’s former colonies.
They were interested in controlling shipping routes in the Atlantic.

The United States never joined the League of Nations, in spite of the fact that an organization such as the League of Nations was the signature idea of US President Woodrow Wilson. He had laid out 14 Points for establishing and maintaining world peace following the Great War (World War I). Point #14 was the establishment of an international peacekeeping association. The Treaty of Versailles adopted that idea, but back home in the United States, there was not support for involving America in any association that could diminish US sovereignty over its own affairs or involve the US again in wars beyond those pertinent to the United States' own national security. Because of its objections to membership in the League of Nations, the United States Senate refused to ratify the Treaty of Versailles.