Here's a list of some of the most historically significant single days:

    July 4, 1776: The United States Declaration of Independence is adopted.
    September 11, 2001: The 9/11 terrorist attacks in the United States.
    November 11, 1918: The armistice ending World War I is signed.
    June 6, 1944: D-Day, the Allied invasion of Europe during World War II.
    January 30, 1933: Hitler becomes Chancellor of Germany, marking the beginning of Nazi rule.

Note: This is a subjective list and other days may be considered more or less significant by different people.
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