1. In 1997, a gunman opened fire at the U.S. Capitol building, killing two police officers. The shooter, Russell Eugene Weston Jr., was later found to be suffering from paranoid schizophrenia and was committed to a mental institution.
2. On January 7, 1800, Congress approved the establishment of the Library of Congress in Washington, D.C. Today, it is the world's largest library with over 170 million items in its collections.
3. In 1979, the Washington Metro, the city's subway system, opened its first line. Today, it has six lines and serves over 600,000 passengers per day.
4. On January 7, 2009, the D.C. City Council passed a law legalizing same-sex marriage in the district. It became the sixth jurisdiction in the United States to legalize same-sex marriage.
5. In 1871, the D.C. government was reorganized and the city was given limited home rule. However, it wasn't until 1973 that the city was granted a mayor and city council with full legislative powers.
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