Loyalty to old immigrants and discrimination against new immigrants is a very broad statement that makes it more correct. Consider that americans, or europeans in particular, wanted all the land they could get their hands on and didn't want to share any of it. As a result their desires were shown in nativism.
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A better class division was made and people could if they become successful or less successful change classes which meant there was more opportunities. The Nile delta was also drained a bit which meant that more farmland could be used for harvesting and people could work and have houses and things like that.
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In 1993, Al Qaeda carried out a bombing of the Twin Towers.
No not all slaves were African american