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Before Europeans arrived in North America, Native American groups developed into distinct and complex societies in response to the unique environments they inhabited.
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The U.S. prepared for war by first building- up the military in readiness for deployment, by initiating a draft. President Woodrow Wilson sought Congress support in the declaration of war against Germany. ... Businesses and citizens were strongly urged to support the war through government and media communications.
Autocracy. An autocracy is a system of government in which supreme power is concentrated in the hands of one person, whose decisions are subject to neither external legal restraints nor regularized mechanisms of popular control
Answer:In 1947, Salk took a position at University of Pittsburgh, where he began conducting research on polio, also known as infantile paralysis. By 1951, Salk had determined that there were three distinct types of polio viruses and was able to develop a "killed virus" vaccine for the disease.
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