• 1945 - USA developed and used nuclear bomb
• 1950 - USA developed hydrogen bombs
• 1953 - both had hydrogen bombs and continued to compete
• 1954 - USA tested the biggest ever hydrogen bomb
• 1955 - B52 bombers (strong enough to blow up Moscow)
• 1957 - the USSR launched Sputnik
• 1957-1959 - USA increased its spending on missiles by 20%