"Look at the numbers in the link above. The United States is being turned into a different country, a Latin American country, an Asian country, an African country all at once, many, many times faster than it turned European after 1492."
I think the appropriate metric for measuring becoming a different country where different is defined as dissimilar along arbitrarily racial lines is to use percentage change in ethnic mix due to immigration per year.
In other word, if you deflate the raw numbers in your table by the total population of the United States at the time, you get really low numbers for the last sixty years relative to their historical averages. Basically think "what's the chance my neighbor is a first generation American?" and you get much lower probabilities today than you would through most of American history. Some people have reason to be happy about this.
In other words, by simply ignoring out of existence the non-white population of the US before 1965 (which is what white people loved to do back then), you can make it look like the country went through a rapid transformation and is rapidly being taken over, when in fact the minority population has always been there.
I think the appropriate metric for measuring becoming a different country where different is defined as dissimilar along arbitrarily racial lines is to use percentage change in ethnic mix due to immigration per year.
In other word, if you deflate the raw numbers in your table by the total population of the United States at the time, you get really low numbers for the last sixty years relative to their historical averages. Basically think "what's the chance my neighbor is a first generation American?" and you get much lower probabilities today than you would through most of American history. Some people have reason to be happy about this.