Ummmm... Herbert Hoover was president from 1929 to 1933 (the period of the Great Depression). He didn't believe in government intervention and what government spending he did do during his tenure was not enough to stop the Great Depression from happening. With that being said, the increase in government spending did end the depression by 1933, which was when the country went into an expansion period. After 1933, GDP did rise up until 1937, when conservatives in Congress basically stalled the New Deal.
Is completely fallacious to say that Hoover didn't believe in government intervention, yet this is what so many historical accounts say about the period. In 1931, Hoover proposed to:
Establish a Reconstruction Finance Corporation, which would use Treasury funds to lend to banks, industries, agricultural credit agencies, and local governments;
Broaden the eligibility requirement for discounting at the Fed;
Create a Home Loan Bank discount system to revive construction and employment measures which had been warmly endorsed by a National Housing Conference recently convened by Hoover for that purpose;
Expand government aid to Federal Land Banks;
Set up a Public Works Administration to coordinate and expand Federal public works;
Legalize Hoover's order restricting immigration;
Do something to weaken "destructive competition" (i.e., competition) in natural resource use;
Grant direct loans of $300 million to States for relief;
Reform the bankruptcy laws (i.e., weaken protection for the creditor).
Hoover also displayed anxiety to "protect railroads from unregulated competition," and to bolster the bankrupt railroad lines. In addition, he called for sharing-the-work programs to save several millions from unemployment.
Hardly what one might call non-interventionist in economic terms, wouldn't you say? Most of FDR's New Deal, in terms of his first few years in office, were continuations of the Hoover Administration's policies.
The 19371938 dip was not the product of tight fiscal and monetary policy, but of excessive government regulation and loose monetary policy. We must clear away the misconception that, without deficit spending and easy credit, the market will fail. This is the fallacy of Keynesian economics, which is the reason why his policies failed...because they cling to a false since of economic reality. Wealth cannot be obtained by simply printing money. The Great Depression is a perfect example of that.
That all depends on what you consider significant. When FDR took office, unemployment dropped from 23. 6% in 1932 to 16.9% in 1937. I wouldn't call a more than 28% drop insignificant. Furthermore, we did see a large drop by the time the United States entered World War II, but that was once again because of government spending (and I don't believe that the military is counted in the unemployment numbers).
This should be no surprise to anyone who has studied the reality of the Great Depression, for US Census Bureau statistics show that the official unemployment rate was still 17.2% in 1939 despite seven years of "economic salvation" at the hands of the Roosevelt administration (the normal, pre-Depression unemployment rate was about 3%). Per capita GDP was lower in 1939 than in 1929 ($847 vs. $857), as were personal consumption expenditures ($67.6 billion vs. $78.9 billion), according to Census Bureau data. Net private investment was minus $3.1 billion from 19301940.
FDRs tripling of taxes, his regulation of business, and his relentless antibusiness propaganda also contributed to a worsening of the Great Depression, but his labor policies were probably the most harmful to the employment prospects of American workers. Taking money from people (by the way of taxes and inflation via the Fed) and giving a small portion back to them in order to dig holes and fill them back in is hardly productive.