Over 80% of Mexicans claim to be of full or partial indigenous descent, and you see similar high percentages in other Central American countries.

In the US, it's around 8% (if you exclude people who identify as White Hispanic/Latino). Canada is around 5-6% depending on how you slice it.

Why is this? Were there simply more natives in Central America? Fewer colonists? Were the settlers in the southern part of the continent less brutal? More willing to intermarry? Were the natives less devastated by European diseases?