Mexico

Instead of being gunned down by a firing squad in 1867, Maximilian von Habsburg and his Mexican Empire were able to keep the power(Propably because of the CSA support). He sold Sonora and Chihuahua to the Confederacy in 1880 for 3 millions dollars. Starting the Second Mexican War

The Empire joined the Entente in the First World War, forced to pay repartation at the winning Alliance (but did not loose territory).

Teddy Roosevelt help creat a Rebellion agaist the empire. With the help of Confederation the rebellion was squash. Mexico remained ally to it during WWII.