The USA Drops a nuke on Japan. This was the start of the cold war because they were basically staring down Russia. They were trying to scare them.
Containment is the practice of making sure something doesn't spread to areas that it shouldn't.
The Atomic Energy Commision was made to be able to develop new atomic bombs to keep up in the arms race.
We also want to make a pact with other european countries to help contain russia. We will call this group nato to protect the peace
We need containment to make sure communism doesn't spread around the globe. If it doesn't spread then it will kill its self.
This also made the polarization of Germany extreme with both sides so different
The purpose of the berlin airlift was to make it so people in west Berlin had the supplies to make sure nothing spread across the borders.
espionage is the practicing of sending undercover agents across seas to seek out information of other armies.
Mccarthyism is spreading fear about spies from the soviet union. They would make it so these people could not get job and would be frowned upon from the world.
Also another big thing about the space race was much fear came from the unknown. 
The space race first started when we found out about sputnik. Sputnik was a satellite circling the world. This caused major fear about spies.
The main thing that came from the arms race was trying to show off power of the army that you created.
The arms race was during the cold war. The goal of each side was to have a stronger army then the other.