Barack Obama, a 47-year-old first-term senator from Illinois, shattered more than 200 years of history Tuesday night by winning election as the first African-American president of the United States.

A crowd of nearly a quarter-million jammed Grant Park and the surrounding area in Chicago, where Obama addressed the nation for the first time as its president-elect at midnight ET. Hundreds of thousands more — Mayor Richard Daley said he would not be surprised if a million Chicagoans jammed the streets — watched on a large television screen outside the park.

“If there is anyone out there who doubts that America is a place where anything is possible, who still wonders if the dream of our founders is alive in our time, who still questions the power of our democracy, tonight is your answer,” Obama declared.