It's due to the superdelegates. If all delegates would have had one vote, Bernie would have won. It's really an extraordinary feat and I think you in the US can be very proud of that. The US political system is conservative because you are really quite progressive compared to many countries. It's really the system, not the people. A young nation of immigrants, people who dare to dream of bettering themselves and take the risk to do so, from many different countries that "back" in Europe still don't see eye to eye. Much to be proud of.

And slavery is "our" doing, not yours (originally), in a way.