why did the US never joined the league of nations

What do you think?

because the treaty of Versailles was never ratify by the Senate

Right.

Why didn't the Senate ratify this treaty? Why didn't the U.S. join the League of Nations?

The United States did not join the League of Nations primarily due to a combination of political, domestic, and ideological factors. Here's an explanation of some key reasons:

1. Political considerations: President Woodrow Wilson, who championed the idea of the League of Nations, faced significant political opposition from members of the U.S. Senate. Many senators were worried about preserving U.S. sovereignty and feared that joining the League would limit America's ability to make independent decisions on foreign policy matters. Furthermore, some senators had personal grievances with Wilson, which further fueled their opposition to the League.

2. Domestic concerns: In the aftermath of World War I, the U.S. population was war-weary. Many Americans had lost loved ones and were disillusioned by the devastating consequences of the war. There was a general desire to return to a policy of isolationism and focus on domestic issues, which made joining an international organization like the League less appealing to the American public.

3. Ideological reservations: The specific terms and structure of the League of Nations were seen as problematic by certain groups in the United States. Critics argued that the League's Article X, which called for collective security and the potential use of force to uphold the League's decisions, could potentially drag the U.S. into future conflicts without its consent or proper debate within the U.S. Congress. This was seen as undermining the principle of congressional approval for declarations of war, which was enshrined in the U.S. Constitution.

It's important to note that while the United States never joined the League, it did put forth the idea and played a significant role in its formation. Nonetheless, these political, domestic, and ideological factors ultimately led to the U.S. Senate's rejection of the Treaty of Versailles (which included the provision for the League of Nations) and the U.S. never becoming a member.