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Abner Doubleday is credited with inventing baseball in Cooperstown, New York.
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Alexander Joy Cartwright develops the rules of baseball.
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The first official game of baseball is played between the Knickerbockers and a group of cricket players.
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The first womens' baseball team is started by a group from Vassar College.
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Candy Cummings throws the first curveball in baseball.
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An all-professional team, the Cincinnati Red Stockings, takes the field for the first time.
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The National League is established, with William Hulbert as president.
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The American Baseball Association, also known as the Beer and Whiskey League, is created.
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Moses Fleetwood Walker becomes the first African-American player in the Major Leagues.
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Pete Browning uses the first Louisville Slugger bat.
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The Players' League is created.
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Cy Young takes the mound in the Major Leagues for the first time.
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The Boston Pilgrims and the Pittsburgh Pirates play the first World Series.
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Alta Weiss is the first woman to play professional baseball
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The first players' strike in Major League Baseball occurs.
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Jimmy Claxton, the first black player in 20th century organized white baseball, is fired because of his African-American ancestry.
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The "Star-Spangled Banner" is sung at a baseball game for the first time.
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In the most famous scandal in baseball history eight players from the Chicago White Sox are accused of throwing the World Series against the Cincinnati Reds.
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Babe Ruth is sold to the New York Yankees.
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Baseball is broadcast on radio for the first time.
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Babe Ruth is suspended for 39 days after disregarding the order of Commissioner Kennesaw Mountain Landis forbidding him from barnstorming between seasons.
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The Negro National League is a huge success.
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Babe Ruth hits his 500th career home run.
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Major League Baseball's first All-Star game is played.
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Major League Baseball's first night game is played.
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The Baseball Hall of Fame inducts its first five players.
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The All-American Girls Professional Baseball League is formed.
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First televised World Series.
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Larry Doby is the first African-American player in the American League.
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The designated hitter rule is established.
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Baseball players strike for seven weeks.
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The American League is created.
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The year without a World Series: the longest and costliest strike in baseball history begins on August 12, and lasts until the following spring.
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For the first time, the Major League baseball season opens in Tokyo, Japan (Chicago Cubs vs. New York Mets).
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October 30, just weeks after the terrorist attacks of September 11, President George W. Bush throws out the first ball of the third game of the World Series in New York's Yankee Stadium.
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Tsuyoshi Shinjo, an outfielder for the San Francisco Giants, becomes the first Japanese player to take part in a World Series game.
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Major league Baseball banned THG, a steroid at the center of a criminal probe involving a SF-area lab.
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The Boston Red Sox won the World Series over the St. Louis Cardinals 3-0 in game 4. It was Boston's sixth championship, but the first after 86 years of frustration.
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US Congressional hearings began on steroid use among baseball players.
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US Major League baseball owners and players agreed to tougher policy aimed at curbing the use of performance-enhancing drugs.
