The last time Americans danced and cheered in the streets was in 1945, when the nation finally defeated its enemies in the Second World War. I have no memories of those exuberant days. But I'm an historian and I've seen plenty of pictures and read many descriptions of the joy and happiness that swept over the country.

Obama's stunning victory is the first time in 63 years that Americans once again danced and cheered in the street. Here on the Left Coast, thousands of Berkeley students danced in the city, wildly cheering his victory. In Oakland's Jack London Square and in San Francisco's Castro District, tens of thousands more gathered for joyous street parties, dancing in the street. It was a bittersweet victory because of the success of those who sought to ban same-sex marriage. That day, too, will come. Of this I'm sure.

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