How did the isolationist actions of the US affect lasting peace in Europe after World War 1? Without US support, the League of Nations weakened significantly. Without US help, European nations could not prevent use of military force Without US help, secret military alliances no longer took place Without US support, European countries did not ratify the Treaty of Versailles

The isolationist actions of the US after World War 1 had a significant impact on the lasting peace in Europe. Without US support, the League of Nations weakened significantly, making it less effective in preventing conflicts and promoting peace. Additionally, without US help, European nations were unable to prevent the use of military force, leading to an increase in tensions and the potential for future wars. The lack of US involvement also meant that secret military alliances no longer took place, as there was no strong deterrent to such actions. Furthermore, without US support, European countries did not ratify the Treaty of Versailles, which further weakened the international community's ability to enforce peace and stability. Overall, the isolationist actions of the US after World War 1 contributed to a lack of lasting peace in Europe, as the League of Nations was weakened, military force was not prevented, secret military alliances continued, and the Treaty of Versailles was not ratified.