It’s one of the biggies.
We influence the world economically partly because we are such huge consumers. We also have businesses abroad or use factories abroad, so we influence employment to some degree.
We come to the aid of countries in crisis big time.
We have a very strong and powerful military with high tech weaponry. Plus, the US seems to be willing to use their military.
People like Bill and Melinda Gates, who happen to be American, are making an impact on world health. They hope to eradicate Polio, maybe some other diseases. They use some of their own money, private donations, and federal government money to fund their efforts.
Several different American charity groups work to educate children in other countries, to help women in other countries become independent, to provide clean drinking water in other countries. Our federal government helps other countries improve their quality of life or get through difficult times. Often it is done as government loans. Many countries also help, it’s not just America obviously.
There have been many incredible accomplishments (noble prize winning accomplishments) that have influenced the lives of others in impovershed areas and little by little improve the world. They certainly are not all American