Answer: d. thirty
Explanation:
During the period after World War II, the United States was the most productive country in the world for approximately thirty years. This era is known as the golden age of capitalism and ended approximately in 1973-1975 with a worldwide recession.
The recession during the 70s ocurred in most of the Western world ending the Post-World War II economic expansion and it was characterized by stangflation. The stangflation is combined by high unemployment and high inflation.
