Second Mexican War

Conflict who lasted from 1881 to 1882, as Anti-Confederate hardliner, James Longstreet declared war of C.S.A for the purchase of Sonora and Chihuahua. The Confederacy sought an alliance with Britain and France (who was gain over the phasing out of slavery in the south)

Long term effect
The conflict deadlocked the animosity between U.S.A and C.S.A as the two entered the European alliance system after the conflict.