The correct answer for the question that is being presented above is this one: "Interactions between humans and the environment." A historian is awarded a grant to study the effects of industrial air pollution on sugarcane farms in Brazil. His research will focus on <span>Interactions between humans and the environment</span>
The causes of the Economic Boom of the 1920s were the Republican government's policies of Isolationism and Protectionism, the Mellon Plan, the Assembly line and the mass production of consumer goods such as the Ford Model T Automobile and luxury labor saving devices and access to easy credit on installment plans.
Originally, electors cast two ballots for president and whoever took second place in the tabulation became vice president. Starting in 1804, the president and vice president were elected on separate ballots as specified in the Twelfth Amendment to the United States Constitution which was adopted in that year.
<span>Many social ills were happening of which people were opposing hence most of Americans found themselves taking part in reform movement which finally helped them to change things. Example of this kind of reform movements are: temperance movement, abolition movement, school and prison reform movement, and many others.</span>
