Why was there an "arms race" between the U. S. and Soviet Union? What types of
weapons were developed?

An "Arms Race" was a race between the 2 super powers to develop weapons of massive destruction which were considered High Class Destruction Weapons. United Socialist Soviet Republics have developed weapons like Inter Continental Ballistic missiles of Medium and Trans-Continental ranges as well as a devastating and terrifying weapon known as the Tsar Bomba which is 57 megatons, 1,500 times more devastating then a bomb on dropped Hiroshima. In fact the Tsar Bomba could leave an explosion behind bigger then all the ammunition, bombs, torpedoes and other weapons used in World War 2 by all countries combined.