Before 1965, the room's admission rules were explicit, and explicitly designed to keep the room's demographics the same. The national-origins quota system that governed US immigration from the 1920s onward reserved roughly 70% of all available immigrant visas for just three countries -- the United Kingdom, Germany, and Ireland -- a formula built specifically to preserve the country's existing Northern and Western European makeup.^[1] It wasn't an accident of policy; it was the policy's stated purpose. Whatever a person from India, Nigeria, Korea, or Brazil might have contributed to a room like the Homebrew Computer Club a decade later, the law made sure very few of them could get in the country to try.

The Immigration and Nationality Act of 1965 tore that formula out by name. The Hart-Celler Act eliminated the national-origins quota system entirely, replacing it with a system built around family reunification and, to a lesser degree, employment-based admission -- no longer sorted by which country you were born in.^[2] Twenty-five years later, Congress opened a second, more specific door: the Immigration Act of 1990 created the H-1B visa, an annual allotment (initially capped at 65,000) for skilled workers in specialty occupations requiring a bachelor's degree or higher -- science, engineering, and information technology chief among them.^[3] By 2023, roughly 65% of all H-1B visas were going to computer-related jobs specifically, and the majority of recipients were Asian nationals.^[4] The room's legal admission requirement had shifted from "which country was your family from" to "can you do this specific kind of technical work" -- a completely different gate, opened on purpose, by a specific Congress, in a specific year.

Measured decades later, the room's occupants actually changed to match. The National Foundation for American Policy has tracked this directly: as of a 2022 count, 319 of the country's 582 unicorn startups -- companies privately valued at $1 billion or more -- had at least one immigrant founder, and the collective value of those immigrant-founded companies, roughly $1.2 trillion, exceeded the entire stock markets of countries including Argentina, Portugal, Ireland, and Russia combined.^[5] By the most recent count, that share had grown further: 455 of 775 US unicorns, 59%, were founded or co-founded by an immigrant, and about two-thirds, 66%, when children of immigrants are included.^[6] This isn't a story about talent suddenly appearing in 1990 that hadn't existed before. It's a story about a room whose locked door finally opened to people whose talent had been sitting on the other side of it the entire time.

Why does this matter? Being in the room already established that access, not talent or curiosity, is the actual gating mechanism for who gets to build something that matters. This piece is the other half of that finding: the room itself isn't a fixed, natural thing -- its shape is a policy choice, rewritten on specific dates, by specific named legislation, and the room's demographics change exactly as fast and exactly as far as those rules do. The pre-1965 room and the post-1990 room produced measurably different Americas, not because the people changed, but because who was allowed to walk in changed, on a date you can look up.