I don't think it's an unsupported assumption, there are a lot less wars between countries now than there was 250-100 years ago, and I think that's due to networks of military alliances and trading partner agreements... I do still think if the US dropped its military alliances there would be unintended consequences and negative effects on US citizens and you remain convinced it would be positive.

It's an interesting thought experiment and I appreciate the time you've taken to explain your position and thought processes. I hope you enjoy the remainder of your weekend.