if memory serves me, it was a border dispute with Mexico over the Texas territory. The Mexicans attacked an American patrol and that was the start of the conflict. But also idk and I could be wrong.
The answers that apply are A, B, and D.
1. GNP rose
2. By the end of the decade automobile ownership decreased dramatically
3. Optimism
4. 18th Amendment
5. America's most important strength
6. Wilson emphasized peace
7. Bought stock on credit