It's not remembered as much as other wars (ww2, Vietnam, etc) ww1 is also kind of forgotten. It's a shame too.
Option 4:) World war two
All the other wars listed happened before communism spread
So what it says is that you have to do the steps they ask you so u can understand it. Reread it again and I hope u get a A+
Shared powers that have been granted in the U.S. Constitution