Also, the 9/11 event offers strong angular transit symbolism with t. Pluto partile conjunct Sibley’s Ascendant opposing t. Saturn.
Pluto transits to the angles are very telling in mundane astrology. Pluto on the AC for the WTC bombing, plus Saturn on DC convinced a lot of astrologers about the accuracy of this chart. I just checked out some history with Pluto transits to the USA AC, just conjunct, opposite and squares:
Square 1807 - A grand jury indicts former Vice President Aaron Burr for treason.
1809 - A decision by the Supreme Court states that the power of the federal government is greater than any individual state.
Opposite1897 - A sheriff's posse kills more than 19 unarmed immigrant miners in Pennsylvania.
1898 - New York City annexes land from surrounding counties, creating the City of Greater New York.
1898 - The US Navy begins a blockade of Cuban ports and the USS Nashville captures a Spanish merchant ship.
1898 – The US declares war on Spain
1898 - The US captures Guam making it the first U.S. overseas territory.
1899 - The Philippine-American War begins as hostilities break out in Manila.
Square 1963 - John F. Kennedy assassination.
1964 - Plans to build the New York World Trade Center are announced.
1964 - Berkeley student riots
1964 - Malcolm X is assassinated in Manhattan.
1965 - Bloody Sunday, 200 Alabama State Troopers clash with 525 civil rights demonstrators in Selma, Alabama.
1965 - 3,500 United States Marines arrive in South Vietnam, becoming the first American combat troops in Vietnam.
Conjunct 2001 - U.S. forces carry out bombing raids, attempting to disable Iraq's air defense network.
2001 - WTC attack
2001 - Enron files bankruptcy protection (to that point, the largest bankruptcy in U.S. history).
2001 - George W. Bush announces the United States' withdrawal from the 1972 Anti-Ballistic Missile Treaty.
2002 - The Dot-com bubble bear market reaches bottom, when the Dow Jones Industrial Average slips below 7,200.
2002 - Iraq War Resolution is authorized by a majority of the U.S. Congress.