How did the hadley-smoot tariff spread the depression

The Smoot-Hawley Act of 1930, was conceived by two Senators: Willis C. Hawley and Reed Smoot with the solid purpose of  mitigating the consequences of the Great Depression. The idea was to protect the domestic economy by increasing the tariff of a wide number of imported goods in order to protect in particular farmers and workers.

The reason why this actually spread the effects of the Depression was because it increased tariff at a level that it made the international commerce more difficult and this certainly brought negative consequences. In addition to that, unemployment actually grew in the years after the Act was passed, due mainly to the weak production, which made the situation even worse.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the answer is d. selective incorporation. (apex)