Why did the united states refuse to join the league of nations?

Because of the terms and conditions

Explanation:

There will always be rules and regulation of such entity, there must be terms and condition. These factors might have contributed to the reason why the united states decided not to be part of the leagues of nations. It might not suit the united states in terms of policies, economy and contribution and the leaders of the united states are concerned and will always put the peoples interest forward before any other thing. This must be the reason they didn't.