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Throughout the 1800 to 1920 and 2000 to 2003, nativism significantly decreased as immigrant opportunities became equal to those of Americans. In the 1850's emerging nativism took many forms, which included a belief that immigrants were mentally and physically defective, that they bred urban slums, and that they corrupted politics as by selling their votes. Others complained that because the aliens were willing to work for low wages, they were stealing jobs from the native work force. Organizations began to develop, one including the Native American Association, which was against immigration in 1837. In 1845, nativists held a convention in Philadelphia forming the Native American Party. Today, parties or organizations against immigrants do not exist as the number of American dropouts from high school increased from 9.9 percent to 12.8 percent. The rise in unemployment among native-born dropouts and their persistently high rate of non-work may be a matter of some concern because they already had the highest rates of unemployment and non-work as well as the lowest wages in 2000. The number of more educated foreign-born workers also increased. Between 2000 and 2003, the number of immigrant workers with only a high school degree rose by about 250,000. At the same time, the number of unemployed Americans increased by more than 900,000 to 2.8 million. These figures show a movement from attempting to exclude immigrants from coming to America between 1800 to 1920 to a development of an equal field of employment between immigrants and Americans in 2000 to 2003. Immigration in 1800's was providing a rapidly growing economy with a cheap and plentiful labor supply; many argued that America's industrial development would be impossible without it. Currently, America's workforce seeks educated individuals, which immigrants can widely provide against Americans. .
Reasons for immigrating to the United States have changed from 1800 to 1920 and 2000 to 2003.