What the government decided to do in June 1930 — against the advice of literally a thousand economists, who took out newspaper ads warning against it — was impose higher tariffs, in order to save American jobs by reducing imported goods.
This was the first massive federal intervention to rescue the economy, under Pres. Herbert Hoover, who took pride in being the first president of the United States to intervene to try to get the economy out of an economic downturn.
Within six months after this government intervention, unemployment shot up into double digits — and stayed in double digits in every month throughout the entire remainder of the 1930s, as the Roosevelt administration expanded federal intervention far beyond what Hoover had started.
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