How did protectionism and tariffs help cause the Great ...

[Garrulous]

NOT a homework question

[Hawke]

They DID NOT.   The Smoot Hawley act had nothing to do with the depression.  Nor did the stock market crash of '1929.   The great depression was caused by the Federal Reserve reeling in the money supply until the country broke.    

Google "the money masters".   its  a very good documentary by Bill Still.    You have to do one hell of a lot of reading to find out what is in the documentary, so its a good place to start.  

I can't remember which  economics guru said it (might have been Volker), something like "You can't have a depression without a contraction of the money suppply and you can't have a contraction of the money supply without a depression".    

But there's a lot of mis-information out there.

[penguins]

It had nothing to do with causing the great depression and non American industry is not traded on the DOW hence Tariffs are good for America.

FDR raised tariffs on metals and that helped bring us out of the depression and is responsible for creating most are steel industry.