On World War II and the Great Depression, see my resource page.
On Hoover and the Great Depression, see America’s Great Depression by Murray N. Rothbard.
On FDR and the New Deal there are numerous books, though I am partial to Bob Murphy’s book The Politically Incorrect Guide to the Great Depression and the New Deal.
On “monopoly” in the 19th century, see my article “The Misplaced Fear of ‘Monopoly,'” and Thomas J. DiLorenzo’s book How Capitalism Saved America.
On the Depression of 1920-21:
“The Depression of 1920-21: A Credit Induced Boom and Market Based Recovery?”
“Warren Harding and the Forgotten Depression of 1920”
There is also some good material in my free eBooks, including Bernie Sanders Is Wrong, 14 Hard Questions for Libertarians — Answered, and the book I mentioned, Your Facebook Friends Are Wrong About Health Care: TomsFreeBooks.com