OK, black people were literally property in mid-19th century America. That's pretty much rock bottom, just 157 years ago. For reference, a full human lifespan is something like 120 years, and the average is a little over 70. So today, a mere two lifetimes later, a guy descended from the slave owners can marry one of the slaves' descendants and nobody even bats an eye. And a first-generation African-American is running the country. In the face of all this, how can you say meaningful change can't happen on the scale of a person's life? (And most of that civil rights process did happen in raganwald's lifetime if he was born before the '60s.)