Despite Wilson's deep involvement in postwar negotiations, the U.S. Senate refused to ratify the Treaty of Versailles or join the League of Nations. What was the reason for the U.S. Senate's refusal?
1) The U.S. Senate believed that the Treaty of Versailles was too harsh on Germany.
2) The U.S. Senate did not want to be involved in international affairs.
3) The U.S. Senate believed that joining the League of Nations would threaten U.S. sovereignty.
4) The U.S. Senate wanted to focus on domestic issues rather than international commitments.