If I recall my history right, the 1929 stock market collapse precipitated the Great Depression, and the tariffs were a (misguided) attempt at trying to set the economy straight.
In case you are seriously asking this is from Wikipedia.
Intended to bolster domestic employment and manufacturing, the tariffs instead deepened the Depression because the U.S.'s trading partners retaliated with tariffs of their own, leading to U.S. exports and global trade plummeting. Economists and historians widely regard the act as a policy misstep, and it remains a cautionary example of protectionist policy in modern economic debates.