Seems the Great Depression began after 12 years of Republican rule ending up with a Republican president, Hoover, that spent four years trying to keep the bread lines straight and orderly and encouraging apple-sellers.
I understand that you are a partisan troll, with virtually zero historical knowledge.
In 1920, the depression brought about by Fabian democrat Woodrow Wilson had brought the nation to it's knees. Determined to induce international Marxism, Wilson had plunged the nation into European wars and European turmoil. The results were a disaster. Domestic business was under attack by the Wilson administration and production was faltering.
William G. Harding swept the election with over 60%, due to the dissatisfaction with Wilson. Bear in mind that Fabian theory was not discredited at the time and Wilson made no attempt to hide his Marxist leanings - in fact it was fully embraced. Democrat Governor James M. Cox ran on a promise of nationalizing commodities such as oil, and was utterly defeated. Cox was the last president, until Obama, to openly advocate socialism.
Harding ended the depression and began an era of prosperity that would be known as "The Roaring 20's.
Harding was followed by Calvin Coolidge. Coolidge is arguably the best president of the 20th century. Coolidge defined conservatism. He removed U.S. troops from foreign nations, lowered taxes and tariffs, substantially reduced the Federal workforce, bringing about the most significant GNP expansion in American history - to this day. Coolidge practiced the economic principles that men such as Rothbard would later document as the most effective means of creating prosperity in the greatest number of people.
After the disaster of Wilson and the incredible success of Harding and Cooldge, the Democrats were a defeated, minority party. Though not widely liked, Harding's secretary of Commerce, "Herbert Hoover" was nominated. In 1928, no Democrat had any chance at the Whitehouse and Hoover easily won office. Hoover was a moderate who likened himself to Teddy Roosevelt and declared himself a progressive.
Hoover was a dedicated follower of British economist, John Maynard Keynes, and crafted economic policy to follow Keynes. An accountant by training, Hoover micromanaged economic affairs. As a result, when a moderate recession hit in 1929, Hoover reacted with Keynesian stimulus and "make work" programs. The result was a disaster and drove the recession into a depression.
When Franklin Roosevelt was later elected, he EXPANDED the Hoover policies, he did not alter them. FDR was also an advocate of Keynes and simply continued the same policies already in place.
Which resulted in the longest and deepest depression in U.S. History.
The Great Depression helped end child labor for an adult could be hired for the same wages as paid to children. Finally, the child-labor matter was settled in 1938 when FDR signed the Fair Labor Standards Act.