First American Spacewalk Was 50 Years Ago by Lt. Col. Edward Higgens White:

On June 3, 1965 spaceman Edward White became the first of Nasa’s elite band of super pilots to step outside of his tin can and float in the dark weightless atmosphere more than 100 miles above Earth.

The American made history that day, but he wasn’t the first to space walk. That was USSR cosmonaut Alexei Leonov who had done the same thing weeks before, but in secret.

White however spent twice as much time outside the Gemini 4 spaceship and was able to manouvre around instead of just float.