Answer:
During the U.S. Civil War, Cornelius Vanderbilt donated his largest and fastest steamship, named the Vanderbilt and built for around $1 million, to the Union Navy. The vessel was used to chase down Confederate raiders. In 1813, Vanderbilt married his cousin Sophia Johnson, and the couple eventually had 13 children.
Most caste systems in our history were based on a person's skin color. I'm gonna take a guess that it would be the same for this part of the world.
The US Army is the answer
