[T]he greatest Kennedy legacy to Obama [is] the Immigration Act of 1965, which created the diverse country that is already being called Obama's America. ... It transformed a nation 85 percent white in 1965 into one that's one-third minority today, and on track for a nonwhite majority by 2042. Before the act, immigration visas were apportioned based on the demographic breakdown that existed at the time of the 1920 Census - meaning that there were few if any limits on immigrants from Western and Northern Europe, but strict quotas on those from elsewhere. The belief that the United States should...