The idea that continents move slowly across the earth's surface is called the continental drift.
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The reason why regions change over time is because the Earths core and insides slide from place to place and this causes our land to move and shift. It can also cause some regions to over lap or sometimes completely cover the other region. It will make the other region disappear and it will no longer be visible.
It's harder to get places and you can't use the water for transportation. There can also be fluctuating temperatures, especially in places like the middle of the US. Weather can be different.
France.
The term coined by journalist John O' Sullivan in 1845 has been used to distort US history. This idea was supposedly why Americans moved to the US western frontiers as a way to put forth the idea that America's democracy and Protestantism had a destiny given to the US by Providence to spread the US society world wide and part of this was to settle westward.This idea is fully without merit. In 1803 the Louisiana Purchase was made that significantly enlarged the US. This was a practical move and it had nothing to do with manifest destiny. Americans moved west to find gold in California, to obtain free land via the Homestead Act, and build railroads in the interest of expanding the nations infrastructure. Yes, a small amount of die hard Protestant evangelicals took to the manifest idea, however, it was not part of why Americans sttled the west, nor why the US fought the Mexican war.
Cherokee's are the large Indian group that resisted the efforts of the government to move them.