I would seriously suggest reading all of the below. It really disproves some common myths about immigrants and their effect on the economy... You can expect me to cite these a lot. There's more, these are just the best articles that I have found.
http://www.aei.org/publication/how-immigration-boosts-american-economic-growth-and-innovation/
Without migration, US economic growth would have been roughly 15 percentage points lower than it actually has been. Or to put it another way: “While not quite putting the US in recession, this is enough to cancel out the majority of post crisis gains.”
How, exactly, does immigration boost growth? First, there is a labor market impact. More immigrants means more hours worked in the economy. Immigration also often boosts labor supply by increasing female labor force participation via the mechanism of “substantially reduced costs in care services.”
Second, an increase in skilled migration can directly increase the aggregate level of human capital while low-skilled migration can indirectly boost the supply of skilled labor by increasing the labor force participation of skilled women.
Third, there is the innovation impact. From the report: “Knowledge, entrepreneurship, and technology are the driving forces of a dynamic economy. Two reliable ways to generate ideas and innovation in an economy are to increase the number of highly-educated workers, and introduce diversity into the workplace.” Immigrants account for nearly half of the US workforce with a science or engineering doctorate, including 60 percent of workers in computer and mathematical sciences. In Silicon Valley, 64 percent of engineers are foreign-born. Indeed, more than half of US startup “unicorns” have at least one immigrant co-founder.
https://psmag.com/social-justice/more-research-finds-that-immigrants-increase-economic-growth
Economists have generally found that immigrants increase wages of native-born workers with higher levels of education... "most estimates find the overall impact on native workers is positive."
Economists across the political spectrum generally agree that immigration increases both economic output and economic growth rates....
There is also little support for the oft-repeated claim that immigrants are sucking the U.S. dry due to their disproportionate use of social safety net programs... immigrants across almost every education category have a more positive fiscal impact than native-born Americans
What's more, while this report looks only at fiscal contributions of first-generation immigrants, economists have found that the children of immigrants are more likely to complete college, and less likely to live in poverty, than native-born Americans (and are thus likely to make positive fiscal contributions). A 2017 report from the National Academies concluded that, after accounting for an immigrant's descendants, each additional immigrant has a long-term fiscal contribution of $173,000–$259,000 over 75 years.
Immigrants to the U.S. are less likely than native-born citizens to be arrested, charged with a crime, convicted of a crime or felony, incarcerated, or institutionalized. This is true even when researchers examine only a brief window of time... What's more, researchers have found that providing legal status to undocumented residents actually causes crime to decline.
^ that's a study from the non-partisan Brookings institution, a source Comrade has cited before (I believe for his 3 keys to stay out of poverty)
https://psmag.com/economics/asylum-seekers-do-not-harm-host-countries-economy
New research that tracks economic trends in 15 Western European nations finds that is absolutely not true. It reports "migration shocks"—unexpected inflows of large numbers of people—"have positive effects on European economies."... "The alleged migrant crisis currently experienced by Europe is not likely to provoke an economic crisis, but might rather be an economic opportunity."...
They report temporary spikes in the number of migrants to a country "significantly increase per capita GDP, reduce unemployment, and improve the balance of public finances."
"The additional public expenses (of temporarily caring for newcomers), which is usually referred to as the 'refugee burden,' is more than outweighed by the increase in tax revenues," they write.
The researchers found "an inflow of asylum seekers..." had a positive effect on GDP three to seven years after the initial spike.
https://www.cnn.com/2018/12/03/perspectives/refugees-boost-us-economy/index.html
Everywhere refugees go, they work hard, pay taxes and start businesses, supporting local economies and creating countless jobs for native-born Americans. According to New American Economy, 13% of refugees start their own businesses, compared to just 9% of the US-born population; in total, our country now has more than 180,000 refugee entrepreneurs, running businesses that bring in $4.6 billion a year.
Those businesses mean jobs for Americans: Nationwide, immigrants found a quarter of new businesses. It shouldn't surprise us, then, that communities thrive when refugees arrive. In Utica, New York, where 15,000 refugees have settled in recent years, a survey of 300 local residents conducted by Zogby Analytics found that almost three quarters believed immigrants' presence had been a boon for the economy. And research shows that the 16,500 or so refugees living in Columbus, Ohio, have created almost 21,300 jobs, and contribute $1.6 billion to the local economy...
Nationwide, according to the Department of Health and Human Services, refugees boost government revenue by $63 billion more than they cost the country.
And despite all of this, Comrade believes that we should close our border completely until we solve for the deficit. That's the most backwards idea that I have ever heard. If we want to lower the deficit, bring in more immigrants, not less.