January 30, 1968: The Tet Offensive of the Vietnam War begin, shaking the American public’s confidence in the war effort.
January 31, 1871: Up to a million birds simultaneously fly over the skies of San Fransisco, momentaritly blocking out the sunlight.
February 1, 2002: U.S. invasion of Afghanistan commences; operation Anaconda begins in Eastern Afghanistan.
February 2, 1887: Groundhog Day is celebrated for the first time in the U.S. in Punxsutanwey, PA.
February 3, 1913: The Sixteenth Amendment to the United States Constitution, the Federal Income Tax, is ratified.
February 4, 1849: The Univesity of Wisconsin is founded, with an initial 20 students in one room.
A version of this article appeared in the Tuesday, January 30th print edition.
Facts courtesy of onthisday.com and history.com