See here. Carlson responded to Biden's charges that Trump's Big Lie was the greatest threat to American democracy in 160 years with, "What about the 1965 Immigration Act?!"
The Immigration and Nationality Act of 1965 was the act that overturned the Immigration Act of 1924, which established a national-origins-quota system that favored Northwest European immigrants over all others; the express stated intent was to preserve America's character as a white country. Since 1965 we've been receiving immigrants from all over the world, mainly Latin America and Asia, but also from Africa.
How is this a threat to democracy?
The Immigration and Nationality Act of 1965 was the act that overturned the Immigration Act of 1924, which established a national-origins-quota system that favored Northwest European immigrants over all others; the express stated intent was to preserve America's character as a white country. Since 1965 we've been receiving immigrants from all over the world, mainly Latin America and Asia, but also from Africa.
How is this a threat to democracy?