The correct answer here is (4) Mongols.
The Mongols were a nomadic people who travelled on horseback and were very proficient archers. They were said to be able to shoot a target from full horseback speed with their bows.
They were led by Genghis Khan and conquered a good portion of Asia and also entered parts of Europe. Their empire was one of the biggest ones to date.
They ambushed the Mongol Empire in China.
Generally speaking, in towns such as New York and Cleveland and Chicago blacks were heavily discriminated against and forced to live in segregated and discriminatory housing projects.