The United States entered recession in January 1980 and returned to growth six months later in July 1980. Although recovery took hold, the unemployment rate remained unchanged through the start of a second recession in July 1981. The downturn ended 16 months later, in November 1982. The economy entered a strong recovery and experienced a lengthy expansion through 1990. July 1981 – November 1982 · 1 year 4 months Peak unemployment: 10.8% (November 1982) · GDP: −2.7% S&P 500: +5.6% over the recession The Iranian Revolution sharply increased the price of oil around the world in 1979, causing the 1979 energy crisis. This was caused by the new regime in power in Iran, which exported oil at inconsistent intervals and at a lower volume, forcing prices up. Tight monetary policy in the United States to control inflation led to another recession. The changes were made largely because of inflation carried over from the previous decade because of the 1973 oil crisis and the 1979 energy crisis. Dates: the National Bureau of Economic Research's business cycle chronology. Wiki link Wiki link