According to the timeline who was the first American woman in space? What year did this happen?

Sally K. Ride on June 18, 1983.

Explanation:

t the age of 32, Sally Ride, an astronaut, became the first American women in space, aboard the Space Shuttle Challenger on mission STS-7, seventh shuttle mission of NASA, along with her four crewmates. She operated the shuttle's robotic arm and became the first woman. The task of this mission involved, launching communications satellites for Indonesia and Canada.

Sally Ride, she joined NASA in 1978 and became the first American woman in space in 1983.