July 7 (UPI) -- On this date in history:
In 1846, U.S. Navy Commodore J.D. Sloat proclaimed the annexation of California by the United States.
In 1898, U.S. President William McKinley signed a joint resolution of Congress authorizing the annexation of Hawaii by the United States.
In 1930, construction began on the Giant Boulder Dam, which in 1947 was renamed the Hoover Dam.
In 1946, Mother Frances Xavier Cabrini (1850-1917) became the first American to be canonized a saint in the Roman Catholic Church.
In 1981, Sandra Day O'Connor was chosen by U.S. President Ronald Reagan to become the first woman on the U.S. Supreme Court. She was unanimously approved by the Senate.
In 1999, a Miami-Dade County jury held the leading tobacco companies liable for various illnesses of Florida smokers. The class-action lawsuit, filed in 1994, was the first of its kind to reach trial.
In 2005, terrorists struck the London transit system, setting off explosions in three subway cars and a double-decker bus in coordinated rush-hour attacks. Fifty-two people were killed and more than 700 injured.
In 2009, thousands of figures from the worlds of entertainment, politics, sports and activism jammed into Los Angeles' Staples Center and about 250,000 others gathered outside the building for a public memorial service for pop icon Michael Jackson.
In 2010, a Paris court sentenced former Panama ruler Manuel Noriega to seven years in prison for money laundering. He was convicted of funneling about $3 million of Colombian drug money into French bank accounts.
In 2011, a federal appeals court barred further enforcement of the U.S. military's ban on openly gay service members, with the "don't ask, don't tell" policy scheduled to end on repeal in September.
-- In 2016, a gunman opened fire at an otherwise peaceful Black Lives Matter rally in Dallas, killing four police officers and one transit officer, and injuring seven others. Police killed the gunmen, who was holed up in a parking garage, using a robot strapped with an explosive.