Why did the senate reject the Versailles treaty after World War 1?

The Senate rejected the Versailles Treaty primarily due to concerns over Article 10, which called for mutual defense commitments among League of Nations members. Many senators, including those led by Henry Cabot Lodge, feared that this could entangle the United States in foreign conflicts without congressional approval. Additionally, there was a growing isolationist sentiment in the country, leading to resistance against international commitments. Ultimately, the treaty was seen as a compromise that didn't align with the interests of a significant portion of the Senate.