The specific situation is as follows:

1. The first financial crisis: the economic adjustment after making a fortune in World War I, mainly due to the weakening of "external demand", starting in 1920 It ended at the end of 1921, about 2 years (industrial decline from July 1920 to the lowest point in April 1921).

2. The Second Financial Crisis (Great Depression): The Great Depression of the 1930s, the core period was from October 1929 to 1933, but it lasted until the beginning of World War II and lasted throughout the 1930s. .

3. The third financial crisis only occurred in 1948, with a slight adjustment of 10% drop in industrial production.

4. The fourth financial crisis. In 1954, due to the end of the Korean War, military demand dropped, and the gross national product and industrial output fell by 1.3% and 5.3% respectively, which lasted only 9 months. By March 1955, it entered a period of upsurge again. Then there are automobiles and real estate, which have given a strong boost to the economy.

5. The fifth financial crisis, which started in March 1957, was mainly caused by the decline in demand for automobiles and real estate.

6. The sixth financial crisis, from February 1960 to February 1961, industrial production fell by 6.2%. From January 1961 to October 1969, the economy continued to prosper for 106 months, and the GDP growth rate has been between 2.5 and 6. During this boom, the Vietnam War played a major supporting role.

7. The seventh financial crisis lasted from October 1969 to March 1972. The economy did not decline significantly, but it was in a state of hesitation. Throughout the 1970s, from the outbreak in December 1973 to the recovery in 1982, the overall performance was "stagflation."

8. The eighth financial crisis, from December 1973 to May 1975, lasted for 18 months.

9. The ninth financial crisis, from April 1979 to November 1982, the crisis came again, lasting as long as 44 months. After the 1980s, the U.S. economy began to recover, which lasted for eight years from December 1982 to the end of 1988. The inflation rate was suppressed, the employment rate increased, and the national economy continued to grow.

The "automated production system" in the United States has greatly improved labor productivity. Especially with the popularization of electronic computers, the aircraft and aviation manufacturing industry achieved great development by the end of 1984.

10. The tenth financial crisis lasted for five years from 1989 to 1993. It experienced a deterioration stage for three quarters and a post-crisis period of about two and a half years. stage, showing a W+W shape. Entering 1993, the U.S. economy began to recover. The country that suffered the most in this crisis was Japan.

11. The Eleventh Financial Crisis (Internet Bubble) lasted for 3 years from March 2000 to March 2003. Starting from the adjustment of Nasdaq, it experienced the 9.11 terrorist attacks and the Enron incident. The prosperity of this period came at the expense of serious overdraft of consumption and insufficient food supply.

12. The twelfth financial crisis, subprime mortgage crisis + financial crisis + financial crisis.