They check there answers using history, like they use primary sources etc.
Answer:
D. The United States should explore many different sources of energy.
Explanation:
N/A
The system which was in practice was the Shogunate system. It was between the two restorations and was about Shoguns who were military leaders. The period was marked by sever isolation and it ended during the Meiji restoration when the Shogunate ended.
The first battles were fought in Lexington and Concord
