They did not try to stop it due, to already bad relations with the soviets, plus if you look at a map of divided Germany you can see that they were deep into the soviets territory. <span />
In the Holocaust, they burned them in incinerators and mass pits. The survivors talk about the horrific black smoke that came out of the chimes and the smell of burning bodies. Horrible really.
Have you ever heard about Louis and Clark and Sacagawea? Anywho after the territory was bought from France Jefferson, the president at the time, sent a group of men to explore the territory. They were led by Louis and Clark, they met an Indian tribe and an Indian woman helped them on their journey.
Government corruption and inefficiency weakened their fightinf ability