> The US must repeal the Immigration and Nationality Act of 1965 (also known as the Hart–Celler Act)

wrote:

The law abolished the National Origins Formula, which had been the basis of U.S. immigration policy since the 1920s.

The National Origins Formula had been established in the 1920s to preserve American homogeneity by promoting immigration from Western and Northern Europe.

Prior to the Act, the U.S. was 85% White, with Black people (most of whom were descendants of slaves) making up 11%, while Latinos made up less than 4%. In opening entry to the U.S. to immigrants other than Western and Northern Europeans, the Act significantly altered the demographic mix in the country.



Thus we have, yet again, 60 years of undeniable proof:

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In the past 60 years, the US has outperformed almost every other country by almost every available measure. And during that time the US had the most diversity and the most immigration of any country.

Your theory about diversity is incorrect.