Problem Statement – The significance of Immigrant Workers on the economy of USA USA can be said as a nation built up of immigrants. Since, USA is an advanced economy, there is a strong desire to settle down in USA by other nations’ residents mainly to enjoy the advanced standard of living available there. Immigration is a controversial issue when examined from an economic standpoint. Critics argue that USA’s resources are limited in nature and by having a liberal immigrant policy with an increase in population connotes that there are more or more people vying for the same restricted resources. USA immigration policy is the highly debatable issue that whether the immigrant workers strengthens the U.S. economy or destabilize as it is a contentious issue both in the past and in the present. According to National Association of Manufacturers (NAM), immigrants have made great contribution to the American economy and technological advancement and it is essential to have such access as USA is under the compulsion to compete and lead. According to Prof. Hanson, there has been dramatic increase in immigration population in U.S. as it has rosen to 12% in 2006 from that of just 5% in 1970. As of 2006, immigrant workers in U.S. constituted 15.3% and supporters argue that without immigrant workers, the U.S. would have 15% less workforce. It is argued that the average wages in U.S. would have been higher by 3% if there has not been influx of immigrant workers (Borjas 1335). Mirroring the splitting up of the country on how to tackle immigration issues, Congress in the United States has thus so far not succeeded to enact any laws to reform their immigration laws. One of the main reasons for this is the absence of much empirical data that can be employed to illuminate this issue so that suitable laws can be enacted or can the existing laws can be reformed. Employing the data and the information available from the “U.S. Bureau of Census 2000”, the U.S. Department of Labor and from peer-reviewed sources, this research essay will make an earnest attempt to validate the hypothesis whether the higher concentrations of immigrants in USA’s metropolitan areas will have higher median household income or not. Research Hypothesis Critics argue that immigrants are responsible for fall in wage in USA and destabilize the U.S. economy, whereas the supporters argue that immigrants make economic contributions buoyant in metropolitan areas. This research paper will address the question of the influence of immigrants on median household income for metropolitan areas in the United States. This research paper’s main hypothesize is that metropolitan areas with higher concentrations of immigrants will have higher median household income. Methodology For this research paper, the data are employed from the United States 2000 Census, which was published on April 1, 2000. The 2000 Census results are widespread in nature and demonstrate logical reports on population transformation, age, race, housing, family structure, apportionment, and household mean income. The census demonstrates economic personality for the United States as well as chosen housing traits for the given year. The census recognizes 3,219 counties, which are aggregated them into 389 metropolitan areas for this research. This research paper will employ U.S. Census data