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Content: Also, the Appalachian Mountains were a physical block to their path. What developments in transportation eventually encouraged settlement to the Mississippi? People wanted to be able to get large amounts of land for a low price, so they moved to unsettled areas like Mississippi. Why was settlement of the Great Plains slow to come with settlers passing it by for California and the west coast? The settlement of the Great Plains was slow because there was the Gold Rush in California, which people gravitated towards for the money in gold, but once it ran dry they moved to the fertile great plains. How did the railroads encourage settlement of the American interior? The railroads encouraged settlement because the people could use the land to farm and ship their good through the railway system to the coasts for people to consume and buy. For what two reasons have people been migrating to the South in recent years? People have been moving to the South for the job opportunities as well as a warmer climate. This has led to large population growth and industry growth, aggravating some other regions.