"The Smoot-Hawley Tariff was more a consequence of the onset of the Great Depression than an initial cause."
Back then, my guess was our main trading partners were European countries and there was somewhat of a cultural, social, industrial and economic equivalence there.
Today our trading partners are place like India, Red China, Taiwan, the Phillippines, where the cultural, social and economic gaps are astronomical with respect to us.
As we speak, this was just posted:
http://www.freerepublic.com/focus/f-news/1735795/posts