Many historic things have happened “On This Day” (April 12th)…what is the MOST significant thing that’s ever happened on April 12th (AND WHY)?

Picture from article below
Picture from article below

Reference article: https://www.upi.com/Top_News/2023/04/12/On-This-Day-Space-Shuttle-Columbia-launched-for-1st-time/8191681254341/

Note: Choose the answer-option that most closely matches your response to this question — which is…

”Many historic things have happened “On This Day” (April 12th)…what is the MOST significant thing that’s ever happened on April 12th (AND WHY)?”

A - In 1861, the [U. S.] Civil War began when Confederate troops fired on Fort Sumter, South Carolina
B - In 1945, U. S. President Franklin Delano Roosevelt died of a cerebral hemorrhage
C - In 1955, U. S. health officials announced that the polio vaccine developed by Dr. Jonas Salk was "safe, potent and effective”
D - In 1961, Soviet cosmonaut Yuri Gagarin became the first man in space
E - In 1981, the “Columbia” was launched on the first U. S. space shuttle flight
F - SOME OTHER THING that’s happened in history on April 12th is the MOST significant thing that’s ever happened on April 12th
G - I DON’T KNOW and/or I DON’T CARE
Select gender and age to cast your vote:
Many historic things have happened “On This Day” (April 12th)…what is the MOST significant thing that’s ever happened on April 12th (AND WHY)?
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