The protection wars are the next three America fought. Theese ones occurred after America had fully expanded it's borders and began to make territories into states. During these we see the most death out of any other time period. It also is what would launch America into a super power.
I considered the next three to be the protection wars for these reasons. We were trying to preserve our country as a whole while still developing new ideas and innovations. Each of these demonstrates how America stood up to adversity and was able to keep on trukcing. These wars would set the stage for many more things to come.
Each did their own part in shaping America. The Civil War was fought to preserve the union by not allowing the Southern sates to secceed. Later on the Union became determined on freeing the slaves as well. America joined World War I because of the sinking of Lusitania which was bound for Britian. It was also fought to help secure other countries and to ensure it wouldn't spill over onto American soil. American Joined World War II after the attack on Pearl Harbor. We wanted to help protect those here at home while also lending a hand to those countries in need.