Charts on Long-Term Trends in Foreign-Born US Population

CBO has some great charts from the US Census that show how the immigrant population has changed over the last 100 years and, even better, how the educational attainment of said foreign-born individuals compares to native-born US citizens.  The big surprise to me is how well people from South America and the Caribbean do education-wise compared with those born here.  Why is that?  Haven't a clue.   But, perhaps it has something to do with another CBO chart that shows the comparatively high number of people from Mexico and Central America who are in the USA in an "unauthorized" status.