The standard measure of immigration in political debate is annual arrivals - how many people crossed the border or received a visa this year. That number is misleading. It captures a single year's flow while ignoring the cumulative population that immigration has already produced.
The more accurate measure is immigrant stock: the total population of foreign-born residents plus their US-born children. Demographers and the Census Bureau have used this term since at least the mid-20th century, and the United Nations Population Division formally tracks "international migrant stock" across all member states. It is the standard metric for measuring immigration's actual demographic footprint.
The Numbers
| Category | Population | % of US Total |
|---|---|---|
| Foreign-born (1st generation) | 51.6 million | 15.6% |
| US-born with immigrant parent(s) (2nd generation) | 23.5 million | 7.1% |
| Total Immigrant Stock | 75.1 million | 22.7% |
Second-generation Americans are having children of their own [2]. Including third-generation descendants with strong ties to immigrant communities, the total climbs to approximately 95 million - nearly 29% of the American population.
By 2050, the Census Bureau projects immigrant stock will exceed 160 million - approximately 36% of the projected US population [3].
Why Immigrant Stock Matters More Than Annual Arrivals
Annual arrival figures create a distorted picture. Admitting 1 million immigrants in a given year does not add 1 million people to the population for one year. It adds 1 million people permanently, plus their descendants.
A simplified model illustrates the multiplier:
- Year 0: 1 million immigrants arrive
- Year 10: Those immigrants have approximately 2 million children (now 3 million people total)
- Year 20: Original immigrants + adult children = 3 million competing for housing and jobs
- Year 30: Second generation forms households; approximately 1.5 million new household formations. Third generation begins arriving.
The 1990s alone added approximately 10 million immigrants to the United States. Their descendants today number approximately 35 million. Each decade's immigration creates housing and labor market demand that compounds for 50+ years.
Geographic Concentration
Immigrant stock does not distribute evenly. 60% of the foreign-born population lives in just 20 metropolitan areas [3]. This concentration intensifies the displacement effect in those specific markets.
| Metro Area | Foreign-Born Share | Median Home Price | Price-to-Income Ratio |
|---|---|---|---|
| Miami | 54% | $550,000 | 8.5x |
| San Jose | 39% | $1,550,000 | 12.2x |
| Los Angeles | 34% | $950,000 | 9.1x |
| New York | 37% | $650,000 | 7.2x |
| San Francisco | 35% | $1,350,000 | 10.8x |
In 1970, San Jose had a price-to-income ratio of approximately 3x. A working family could buy a home on a single income. Today it is 12.2x. The foreign-born population grew from 8.7% to 39% over the same period.
The metros with the highest immigrant stock have the least affordable housing. This is not a coincidence. More people competing for the same housing supply drives prices up. When the additional population arrives faster than housing can be built, the result is permanent unaffordability for the families who were already there.
The Economic Displacement Mechanism
Immigrant stock affects the economy through three channels:
- Housing competition. Every person in the immigrant stock population needs somewhere to live. 75.1 million people is equivalent to approximately 28 million households. In markets where housing supply is constrained, this additional demand raises prices for everyone. The Americans most affected are young families trying to buy their first home, working-class renters in high-immigration metros, and seniors on fixed incomes whose property taxes rise with neighborhood values.
- Labor market competition. The foreign-born labor force reached 31.4 million in 2024 [9] - one in five American workers. In industries where immigrant workers concentrate (tech, construction, agriculture, healthcare), wages face downward pressure. The second generation enters the same labor market, compounding the competition.
- Infrastructure and public services. Schools, roads, hospitals, and transit systems were built for the population that existed when they were constructed. Adding 75 million people strains every system. School districts in high-immigration metros teach in dozens of languages. Hospital emergency rooms serve populations far beyond their designed capacity. Highway systems built for 1970s populations carry 2025 traffic loads.
The Cost to American Families
The displacement is measurable:
- Homeownership: The homeownership rate for Americans under 35 fell from 43.6% in 1980 to 37.4% in 2024 [6]. In high-immigration metros, the decline is steeper.
- Rent burden: 50% of renters in high-immigration metros spend more than 30% of income on housing, compared to 40% nationally [6].
- Wage suppression: Harvard economist George Borjas estimates that immigration transfers approximately $516 billion annually from American workers to employers and capital owners.
- Fiscal cost: The National Academy of Sciences found that first-generation immigrants cost state and local governments more than they contribute in taxes [10]. The fiscal balance does not turn positive until the second generation.
Decolonization and the Right to Demographic Self-Determination
In the 1960s, decolonization movements across Africa and Asia established a principle that the international community accepted: indigenous populations have the right to control their own territory, determine their own demographic future, and not be economically displaced by wealthier outsiders.
When Algeria expelled French settlers who owned 40% of cultivated land despite being 10% of the population, the world approved. When Kenya implemented "Africanization" policies, the world approved. The principle was straightforward: a people should not be displaced in their own country.
The same principle applies to Americans being priced out of their own cities by an immigration system that imports millions of workers and their families without regard for the housing, wage, and infrastructure consequences for the existing population.
Policy Implications
If policymakers measured immigrant stock instead of annual arrivals, the policy conversation would change immediately:
- Total stock, not annual flow: Instead of asking "How many can we admit this year?", ask "What total immigrant stock can our housing, labor, and infrastructure sustainably support?" If high-immigration metros have price-to-income ratios above 7x while the sustainable threshold is 4x, current levels are too high.
- Geographic distribution: Concentrated settlement in 20 metros intensifies displacement. Policies should distribute settlement to regions with labor shortages and affordable housing rather than funneling arrivals into already-strained coastal cities.
- Generational accounting: Every immigrant admitted creates 50+ years of housing demand for themselves, plus another 50+ years for their children. Admitting 1 million immigrants annually means committing to 4-5 million additional people within 30 years.
The Center for Assimilation advocates reducing immigration by at least 50% and measuring the policy's success not by annual admissions but by the total immigrant stock relative to housing affordability, wage growth, and infrastructure capacity.
Sources
- Pew Research Center, "Key Findings About U.S. Immigrants," 2024 - First and second generation population data
- Census Bureau, "Second Generation Americans," 2023 - US-born children of immigrants statistics
- Migration Policy Institute, "Frequently Requested Statistics on Immigrants and Immigration" - 2050 population projections
- USCIS, H-1B Employer Data Hub - Visa approvals by employer and salary data
- National Association of Realtors, "International Transactions in U.S. Residential Real Estate," 2023 - Foreign real estate purchases
- Demographia, International Housing Affordability - City-level price-to-income ratios
- Saiz, Albert, "Immigration and Housing Rents in American Cities," Journal of Urban Economics, 2007
- United Nations Population Division, International Migrant Stock - UN definition and global tracking of immigrant stock
- Bureau of Labor Statistics, "Foreign-Born Workers: Labor Force Characteristics," 2024
- National Academy of Sciences, "The Economic and Fiscal Consequences of Immigration," 2017