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May 5, 1961Reputable sourceWell documented

Alan Shepard is the first American in space

On the timeline · around May 5, 1961 · Alan Shepard is the first American in space19541956195819601962196419661968

What happened

Shepard's 15-minute suborbital Freedom 7 flight made him the first American in space, weeks after Gagarin's orbit.

Why it matters

It proved US crewed spaceflight worked and set up Kennedy's Moon commitment 20 days later.

Sources

Alan Shepard is the first American in space — A Timeline of Space Exploration · SourcedStory