Although Gunpowder was created by the Chinese and remained a monopoly until the 13th century, once Europeans were able to use it, the Era of Discoveries changed deeply. It was one of the reasons that the conquest and the colonization of the Americas by the Europeans was possible. Without guns and gunpowder, Europeans would have to fight a long war with a series of Native Americans in all the Continent. Guns made the job easier and this is why the death toll was super high.
Buffalo soldiers didn't only battle Native Americans. They also fought wildfires and poachers in Yosemite and Sequoia National Parks and supported the parks' infrastructure. The Buffalo Soldiers' main duty was to support the nation's westward expansion by protecting settlers, building roads and other infrastructure, and guarding the U.S. mail. This probably didn't help since it was late
The statement that is true in the Pacific theater during World War II is that the Navajo Indians in the U.S. Marine Corps developed an unbreakable code using their native language.
