Chronological order would be:
Sputnik 1 was launched
NASA was founded
Yuri gargian went into space
Johnn Glenn Orbited Earth
Neil Armstrong Walked on the moon
Step-by-step explanation:
These were some of the landmark moments in the space exploration that was in full swing at the time.
This began with Sputnik as the first satellite outside earth that was artificial.
Then came the foundation of NASA to make such missions for the US.
After this it was Yuri from Russia that went out into the space.
It was only after this happened that US caught up to the Russians in the space race and sent the first man to circumnavigate the earth and were eventually the first nation to reach the moon.