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Cultural environment, hope this helps ;)
The United States failure to participate in the newly created League of Nations after World War I resulted in increased isolationism during the 1920's and early part of the 1930's. Many American citizens did not want to be involved in foreign affairs anymore. This is especially true considering the toll in both casualties and cost that World War I had on American citizens and the government. This resulted in the US playing a smaller role in international affairs and a refusal to join World War II until almost 2 years after it officially begins.
Macroeconomics rose from two different factors that are known as theories. The business cycle theory and the monetary theory, which was believed that different monetary factors couldn't and may not affect real factors, such as outputs, yet several theories has passed, different economists proposed and explained numerous theories, yet some leads to unanswerable holes, until theories and different factors were combined to create a formal consensus that every one has agreed upon and later on, several new growth theories rose for the betterment of the economy in the long-run.