The answer is D, after the gulf of Tonkin resolution the war in Vietnam began to escalate.
Growing crops such as tobacco, cotton, and food crops.
The main <span>effect of Germany's decision to allow *unrestricted* submarine warfare was that the United States was drawn into World War I--since this warfare led to the sinking of the Lusitania, which was carrying many American passengers. </span>
Yes, because if they didn't work you had to wait a year to grow more crops.
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