Pro to the question "Should the Government Allow Immigrants Who Are Here Illegally to Become US Citizens?"
“Legal status would boost the economy, but the resulting productivity and wage gains would be much higher if the vast majority of the undocumented population are granted citizenship. Researchers found that immigrants who are only eligible for legal status, but not citizenship, would contribute about $832 billion to the economy in a ten year period, add 121,000 more jobs per year, and pay $109 billion in taxes over a ten-year period. Compare that to a scenario where undocumented immigrants are granted legal status and citizenship at the same time, the U.S. GDP would grow by $1.4 trillion over a ten year period, immigrants would help to create an additional 203,0000 jobs per year, and add $184 billion in tax revenue. In another scenario where undocumented immigrants are granted legal status and citizenship after five years, the GDP would grow by $1.1 trillion, there would be an additional 159,000 jobs per year, and add $144 billion in tax revenue."
“Why Citizenship Is Better for America Than Legal Status," thinkprogress.org, Jan. 31, 2014