The Civil War was begun by Democrats angry at the election of the very first Republican president and afraid he would remove their right to own black men women and children who fled the union ( the very first fleebaggers ).
WW I -- Democrat president
WW II -- Democrat president
Korean War -- Democrat president
Vietnam -- first aid sent to the French by Harry Truman. Democrat John F. Kennedy committed troops on a significant scale and Democrat Lyndon Johnson faked the Gulf of Tonkin incident to involve us in a full-scale war.