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There was a lot of opposition to black people leaving the south because the white planter class did not want to lose their cheap labor if the blacks migrated westwards. They even went to the extent of closing the Mississippi River and intimidating to sink boats carrying the African Americans
A difficulty that had to be overcome during the building of the Transcontinental railroad was Native raiding on work camps.
Ancient societies like the Mayans had a social structure similar to Egypt's pyramid structure. Hope this helps :)
