The answer is the society.
Economics is focused on the problem of the society which is created by a world with limited resources and people with unlimited needs and wants.
FDR's first major act as president was the Emergency Banking Act. Passed just 5 days after his inauguration, FDR did this in hopes of stabilizing the banking industry. At this time in the US, the Great Depression was in full swing and banks were struggling. This is because so many people were trying to take out their money from the banks that thousands of banks all over the country were forced to close due to lack of paper currency.
With the Emergency Banking Act, FDR declares a "bank holiday." This 4 day period allowed the federal government to start reorganizing the banks and to provide currency to those banks who needed it.
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The U.S refused to recognize the Philippines independence.
Most cause were in the U.S governments quest for an overseas empire of the Filipino people for freedom.
Significant conversions also occurred beyond the extents of the empire such as that of the Turkic tribes in Central Asia and peoples living in regions south of the Sahara in Africathrough contact with Muslim traders active in the area and Sufi orders.