Arrange the following events in space exploration in chronological order

1 humans orbited earth.
2 sputnik i was launched into space.
3 the first human stepped onto the moon.
4 explorer i was launched.

October 4, 1957 - Sputnik I was launched into space

Sputnik I, launched on October 4, 1957 by the Soviet Union, was the first artificial satellite in history.

January 31, 1958 - Explorer I was launched

Explorer I was the first artificial satellite placed in Earth orbit by the United States. It was launched on January 31, 1958 in response to the launching of Sputnik I and Sputnik II by the Soviet Union, thus giving way to the space race, closely related to the Cold War.

April 12, 1961 - Humans orbited Earth

On April 12, 1961, aboard the ship Vostok I, the Soviet Yuri Gagarin was launched into outer space being the first human being to reach it and travel through it.

July 20, 1969 - The first human stepped onto the Moon

In July of 1969, as part of the Apollo 11 mission, Neil Armstrong and Buzz Aldrin descended to the surface of the Moon and walked through it for two and a half hours.

the population grew a lot and was making more money

d) he bring down boss tweed and tammany hall.