What was the population of the areas annexed by the US from Mexico in the 1840s? Basically, "Texas," "California" and the area in between?
There was fairly little mixing between European settlers and the first peoples in what is today USA and Canada. There was extensive mixing in what is today Mexico (modern day: 65% Mestizo, 17.5% ...
My question here is, "How has the enforcement (and attitude) toward the USA-Mexico border changed over time?