Today in History: On November 12: 1954, Ellis Island officially closed as an immigration station and detention center. More than 12 million immigrants arrived in the United States via Ellis Island between 1892 and 1954. In 1927, Josef Stalin became the undisputed ruler of the Soviet Union as Leon Trotsky was expelled from the Communist Party. In 1936, the San Francisco-Oakland Bay Bridge opened as President Franklin D. Roosevelt pressed a telegraph key in Washington, D.C., and gave the green light to traffic. In 1948, former Japanese premier Hideki Tojo and several other World War II Japanese leaders were sentenced to death by a war crimes tribunal. In 1970, the Bhola cyclone struck East Pakistan, now Bangladesh. The deadliest tropical cyclone on record claimed the lives of an estimated 300,000-500,000 people.