The allies of world war 2 agreed early in 1942 that their first military goal would be the

 The winning of the war in Europe against Germany.

This was the "Europe first" strategy, coupled with simply holding Japan at bay in the Pacific theater of the war until Germany was defeated.  With the scale of the war and the resources needed to defeat the powerful Axis powers, there was a challenge to allocate military personnel and hardware.  The strategy was to win the war in Europe first, and then go after Japan.  

haitian revolution slaves initiated the rebellion in 1791 and by 1803 they had succeeded in ending not just slavery but french control over the colony