Far from being necessary immigrants are a drain on the economy. The vast majority of immigrants have few skills. These low skill migrants pay few taxes and take a lot of government benefits. For example in the United States each immigrant without a high school diploma costs the US taxpayers $89,000 over their lifetime. Since there are six million illegals without a high school diploma living in the US this adds up to half a trillion dollars. This increases further if they are given an amnesty so are able to claim citizenship and more money and the costs spiral yet further when the cost of educating their children is included with the possible cost rising to $2 trillion. [1] Some migrants may be necessary as a country ages, but the state should pick the migrants it wants - if a state wants migrants with skills to work in care homes it should let in those who have those skills or are applying to colleges to learn the relevant skills rather than granting an amnesty to those who are already here regardless of their worth to the economy.  [1] Rector, Robert, ‘Importing Poverty: Immigration and Poverty in the United States: A Book of Charts’, The Heritage Foundation, 25th October 2006,