When you say most countries, which countries are you talking about?

And if you’re wondering where the US goes for help, I’m not sure what you mean, but there have been a variety of peacekeeping missions and wars over the past few decades where other countries worked alongside the United States. Whether you think those military operations were justified is a different question, but if you’re looking for which countries worked together, you can easily find out by browsing Wikipedia for 20 minutes.