Why did so little people settle west of the mississippi river between 1700 and 1800

The land west of Mississippi during the 1700's and most of the 1800' was land that was still dominated by the Native American tribes and the Spanish, and it was not safe at all for people to move in those parts considering the very bad relations with the native populations in that time of period. Also, the authorities, still hadn't tried to motivate people and try to make them settle in those areas with some measure that was going to be attractive for them.

the answer is a, salt plain

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

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