I wonder how you can believe that knowing all the coups organized by CIA, wars waged by US military everywhere in the world, countries US split in two or more ...etc. it was only safe for USA and its allies. Only difference is war is getting close to western Europe so it's felt more
Sure. There was chaos perpetrated by the Americans. On the other hand, most countries remained peaceful as a result of the American hegemony. The country I live in and its neighbors will go to war immediately if there was no UN/USA. Now think about the rest of the world. Every country will want a piece of its neighbor and there you have it: Total world chaos.
When you compare it to the world before an engaged America (so early 20th century), it was worse. Quite a bit worse. Instead of the US causing regime change, you had European countries conquering and annexing most of the world.
Peace for who? that's the question. No one denies it brought peace to the west.
The reason developing nations want a multipolar world is to have room to manoeuvre and develop themselves, to be able to bargain with multiple powers, there is not much bargain in a unipolar world, when the USA does not want you to get too big, or your interest conflicts with theirs you're fucked.
USA (and the west) has learned that colonialism with a foreign army does not work efficiently, so they colonize countries by choosing who gets elected or performing coups and putting people that serve that interests even on the detriment of their nation.
African nations make a good example for countries that are officially independent but have no sovereignty whatsoever.
It's a monopoly of power, what's worse is it thinks it's interests are what defines good and bad.