When it comes to us, literally nobody is doing their part. They've relied on us to prop up everything (and I mean nearly everyone in the world) and maintain world stability and peace while calling us every name under the sun (including imperialists, selfish, whatever). Because of that, our politicians largely back out of flexing our strength in ways that are meaningful and good for Americans (and what is good for Americans is frequently good for the world), and instead just crap resources into wasteful places like Ukraine. The thing that kills me about people that think "hurr durr Trump threatening war" is that they forget we historically had a policy of using our economic and industrial strength while walking around with our giant stick in hand- not using it, but making sure people knew it was there.
China is doing that today and eating our lunch around the world, and unfortunately eating everyone else's too. Because of dingbats whose brains can apparently only process information unilaterally, if we have someone that says "damn, we need to preserve our trade routes and economic interests abroad, we don't want to use our stick, but we will to put you in line if you don't listen" they start ranting and raving like lunatics. The neat thing about this country is that once that stick is shown, almost everyone falls in line, because they know American influence in their country gives them more freedom to be themselves and to prosper, whereas China just uses and abuses.