We have plenty of room. Productive members of society can only be an asset.
The greater the excess of semi-skilled and unskilled workers, the less companies have to pay employees and can fire employees without hesitation having a line of replacement applicants. The more wages are pushed downward, the more companies make.
For those who can not find a job or their wages are not sufficient to live on, the government will collect money from those who do have jobs to give it to those who do not and those who need more money.
Further benefiting corporations and businesses is if the employees are illegal and otherwise unable to find a job, many are willing to work for less than minimum wage - until legislation rightly eliminates it, without any benefits and the company paying no payroll taxes or meeting any other requirements.
By constantly pushing wages of blue collar labor downward in relation to inflation, while increasing inflation thru government debts, corporations can greatly profit and the owners are insulated from the effects of inflation and dropping wages.
If sufficient recruiting is done for enough tens of millions more migrants, ideally off-the-books wages can be reduced to no more than $20 for a 12 hour day, with this effectively reduced to $10 by inflation. Needing more to survive will create great loyalty to the government by necessity. The economic benefits by mass immigration to businesses and the government is enormous.
While extremely costly in terms of national debts and inflation, countries such as China will loan us money to pay the growing debt and at no more than 10% interest. By perpetually raising the debt, we never have to pay the debt and instead those other countries who loan the money can cash in on the debt using it to acquire more American land and businesses - reducing the burden of Americans being liable for the property and businesses. In addition, the higher the level of inflation by increasing the national debt, the less value the debt has dollar for dollar.
Ideally, the goal should be an unemployment rate of approximately 25%, the level of unemployment in the city Pete Buttigieg is mayor of and why some support him as he understands the great benefits of high unemployment. This then could be combined with increasing the national debt 25% per year with a matching level of inflation and and reducing wages by 25% per year via additional still more 10s of millions of immigration. This also would prevent the USA from having any significant military force thus ending the USAs evil imperialistic involvement in of the world.
The net effect benefits from increasing massive numbers of migrants also includes eliminating the greed of the United States and Americans, at first to equalize to the lowest level of quality of life of the lowest income countries of the world for ethical fairness, and then still lower as a punitive measure for the misdeeds of the United States and Americans in the past. Annual increased millions of immigrants also has the added bonus of dramatically lowing the USA's carbon footprint by such cost saving measures as eliminating residential electricity, making vehicle fuel for personal vehicles too expensive for working people to afford, and making meat unaffordable - all to do our part to stop the imminent and permanent destruction of life on earth as we know it by 2031.
Those and other benefits of annually adding millions and ideally tens of millions of low-skill and no-skill uneducated migrates are almost too numerous to count. Eliminating police abuse by eliminating the funds for police,
eliminating old structures by fires by the elimination of fire departments,
with road and bridge deterioration to make them unusable further restricting burning vehicle fossil fuels,
closing down private charities as that is governments job,
closing down churches to get around the government prohibited from formally banning religions because off people being unable to contribute,
and - ideally - so reducing the value of money that ordinary people revert to some fashion of a barter system such as trading working all day at a restaurant in exchange for a meal - as just a few more benefits.
We should use Amtrak, military vehicles and aircraft, contract with FedEx and UPS for their trucks and aircraft, seize private semi trucks, use cargo container ships all to be filled as tightly as possible with poor uneducated people from around the world - but mostly south of our border - to immediately bring in as many tens of millions as rapidly as possible. Housing would be by requiring those existing in the USA to adopt one migrant family per household into their own home for free and providing their meals.