When was the first World Series played?

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Barry Bonds of the San Francisco Giants swings his bat after hitting his record-breaking 756th home run, with the catcher, umpire, and a cheering crowd behind him at AT&T Park. — History of baseball Giants legend Barry Bonds hitting his record-setting 756th career home run, August 7, 2007.

The first World Series was played in 1903.12

Following a period of competition between the National League and the newly formed American League, the two leagues reached a peace agreement in 1903 that led to the inaugural postseason series. In that first contest, the Boston Americans (AL) defeated the Pittsburgh Pirates (NL) five games to three.12