Why did white people leave the Great Plains to the native Americans until the 1850s?

Space is not completely empty. there are small particles in space. what happens when these particles come together?

Kennedy singles out one group of countries that the united states will defend against any attacker what countries are they

Which goal was most likely to be supported by both poor peasents and city merchants in the early years of the french revolution? an end to feudal privileges overthrow of the monarchy destruction of the power of the catholic church suppression of the third estate take your time to answer, i'm not in a big rush