TBHT: The US Government ought to increase the numbers of immigrants allowed into America

"Between 1880 and 1920 America became the industrial and agricultural giant of the world. . . This couldnot have been done without the hard labor, the technical skills and entrepreneurial ability of the23.5 million people who came to America in this period.” (Kennedy, 1964, p. 34)" [1]

• The resolution clearly refers to the moral obligations of the US, arguments regarding the legal impacts are therefore not topical - as they fall outside of the resolution. (Topicality is a priori issue)
  
• Words such as "allow" within the resolution are distinct in clarifying that we are not discussing illegal immigrants allowed into the US, we are talking about legal permanent residents. 
  

"We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America."

• "Immigrants take jobs from Native-born Americans" - This is probably one of the most commonly cited arguments. The general logic is that immigrants will move into a new community with a diverse skill set, and are generally willing to work for lower wages than Native-born Americans, therefore, they would obviously steal jobs away from native workers. This is actually steel manning this argument, as it is typically asserted ad hoc, without any sort of justifications. However, even without refuting some of the logic used in the example, the data simply does not support that claim. In fact, Immigrants typically create more jobs than they take; see source [15]:
  

"Their analyses revealed that immigrants do start companies at higher levels than native-born Americans—and that this is true for both small companies and very large ones. This led the researchers to an intriguing conclusion. “Immigrants actually create more jobs than they take,” says Jones."

• "Immigrants use more benefits from the government than they ever give back" - The argument here is admittedly a little bit more complex than the one before it. Immigrants come here and (presumably-i.e-falsely) come in and take more jobs, while taking those jobs they only receive little income; however, as they typically have larger families they get huge incomes in benefits from the government, all while paying relatively low taxes due to their low-income wages. Again, I was giving the argument the benefit of the doubt here; moreso, the argument is not supported by the data; immigrants give back more to the economy than they take; [16]:
  

"Immigrants paid in 2014 an estimated $223.6 billion in federal taxes. This includes $123.7 billion in Social Security tax and $32.9 billion in Medicare tax. On the state and local level, immigrants paid $104.6 billion in taxes. The combined contribution of immigrants in 2014 was $328.2 billion in taxes. In California, immigrants pay 28 percent of the total taxes in the state."

• "Most empirical studies indicate long-term benefits for natives’ employment and wages from immigration, although some studies suggest that these gains come at the cost of short-term losses from lower wages and higher unemployment."
  
• "Immigrants also bring a wave of talent and ingenuity, accounting for a disproportionate share of workers in the fields most closely tied with innovation. A 2011 survey of the top fifty venture capital funded companies found that half had at least one immigrant founder and three quarters had immigrants in top management or research positions"
  
• "Immigrants in general — whether documented or undocumented — are net positive contributors to the federal budget. However, the fiscal impact varies widely at the state and local levels and is contingent on the characteristics of the immigrant population — age, education, and skill level — living within each state."
  
• "Economists generally agree that the effects of immigration on the U.S. economy are broadly positive. Immigrants, whether high- or low-skilled, legal or illegal, are unlikely to replace native-born workers or reduce their wages over the long-term, though they may cause some short-term dislocations in labor markets. Indeed, the experience of the last few decades suggests that immigration may actually have significant long-term benefits for the native-born, pushing them into higher-paying occupations and raising the overall pace of innovation and productivity growth. "