Your statement is far too broad to be correct in any case. Thousands of Chinese and other non-white people immigrated long before 1965. Ironically, some of the earliest Chinese people employed by the federal government were employed by Customs, decades before 1965.
Yes, my broad statement about US immigration policy is incorrect because of a few exceptions. It's impossible to talk about trends and averages because there's always a counter-example somewhere that, by your logic, disproves the whole thing. This gas is not hot - look at these ten molecules, they're moving slow! I guess China is open and welcoming too, because they have thousands (1.4 million!) of foreigners living there?
(0.1% of China's total population, but why let statistics get in the way of anecdotal reasoning?)
Are you really incapable of thinking statistically, even this little bit, or are you just playing dumb because it lets you avoid engaging honestly with the question a little bit longer?