First, America has great medical care. For instance, nurses and doctors are way nicer and know more about what they're doing and what they're talking about. Without them, we would have sicknesses, infections, broken/fractured bones, sore muscles, and a lot more left and right. Nobody would know what to do!
Second, America has a very strong military. For example, the military got better guns and equipment to defend us against our foes. they work very hard all day with training and trying to make plans. Lacking them would mean people
worrying if they are going to see their home again, or parents worrying that they won't see their children again. It would be a very stressful time.
Last, America has a lot of people willing to help people in need. For instance, during the 2016 flood in Louisiana, people got together and collected supplies that didn't get damaged. Then they gave it to people who needed it. With no people to help, people would rob, or worse killed. People would yell for help but never get any.