"In general, nativism is a form of ethnocentrism that considers previous residence in a country or region to constitute a claim to superiority in culture or a higher class of citizenship. In the United States, nativism has been defined as 'the intense opposition to an internal minority on the grounds of its allegedly un-American characteristics'..."
2009 study from the Journal of Ethnic & Migration Studies. The paper argues that illegal immigration has a positive impact on the US economy; although illegal immigrants impose a fiscal cost at the state and local levels, this cost should be addressed by efficiently allocating resources between the federal and state governments
"The article focuses on the dynamics of immigration in the U.S. and its economic implications... Economic gains from immigration is still a cause for debate among policymakers since although labor shortages in growing regions and industries are catered to, wages of native workers are affected by competition with these migrants."