This is when Robert E Lee surrendered the Army of Northern Virginia to Ulysses S. Grant, General of the Army of the Potomac. Thus ending major conflict in the US Civil War.
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Reformation was a far more important result of the printing press, as it spread Martin Luther's manifesto regarding the impotency surrounding the Catholic Church. The mass production of the 95 thesis is a main reason parts of Europe are heavily Lutheran to this day.
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