In 1513, Spanish explorer Vasco Balboa crossed the Isthmus of Panama and became the first known European to see the Pacific Ocean.
In 1882, the first Major League Baseball doubleheader was played between the Providence, R.I., and Worchester, Mass., teams.
In 1981, Sandra Day O'Connor was sworn in as the first female U.S. Supreme Court justice.
In 1992, a judge in Orlando, Fla., granted a 12-year-old boy's precedent-setting petition to "divorce" his mother.
In 2008, federal regulators seized Washington Mutual in what officials said was the biggest bank failure in U.S. history.
In 2012, China christened its first aircraft carrier. Officials said it would be used for training and testing but critics said it was a waste of money and likely would never be used in combat.
In 2014, U.S. Attorney General Eric Holder announced he was resigning after six years in the post. He said he would stay on until a successor was named. Loretta Lynch was sworn-in to the office in April 2015.
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