> a multi-polar that in essence agrees to the best possible outcome, even as we explore it, seems perfectly within the interests of all

Multi-polarity is generally code for regional hegemony. That's great if you're the regional hegemon. Not so much if you're the hegemon's neighbor.

America is a maritime power. These (think: Carthage, Venice, Portugal, the Dutch and Britain; counterfactual: Japan) have historically relied on trade, and trading outposts, to project power. As such, they're a natural friend of small countries resisting regional hegemony.