the US has been at war in some shape for form for 90% of its history, hard to call that "peaceful". a good chunk of American prosperity you can chalk up to the

the US has been at war in some shape for form for 90% of its history, hard to call that "peaceful". a good chunk of American prosperity you can chalk up to the random luck of geography; abundant natural resources, two oceans separating from rest of the world, lack of many close neighbors, etc.