Spanish-American war
In the late 1800's the island of Cuba was still under Spanish rule. In 1895 the Cuban people rebelled and Spain sent 1500 troops to restore order. As part of their strategy, the Spanish relocated thousands into 2 concentration camps. These camps had miserable conditions. Many Cubans died.
The war ended with signing of the treaty of Paris. Promised the US would allow for Cuban independence by not annexing the territory.