speaking of the role of the US in other countries, because of its military might and economic power and open society, it cannot but help to play a particular role.
It started with saving Europe from Hitler and the Nazis and digging Europe out of a hole caused by war devastation.
When the Tutsis were being slaughtered, the impending presence of the US drove fear into the Hutus. The pity is that Bill Clinton acted too late.
When the Europeans did not respond to modern day Nazi-ism in Bosnia it took the US, albeit a late Bill Clinton, to stop genocide.
When the Somali pirates were kidnapping other countries' sailors and disrupting commerce, it was the US that acted to keep the shipping lanes open. The same with Taiwan and others in the South Pacific Sea when China threatened.
The world uses the GPS system courtesy of US space satellites and technology.
When natural disaster strikes it's the US whose military and other personnel and US charity that helps.
Yes, the US does wrong things with interfering in other countries' business from time to time; but its importance in interference cannot be overstated.