Social scientists study people. For example: Anthropologists study human evolution and their culture. Physcholgists study people and the working of their mind!
George Goethals was the military engineer who completed construction of the Panama Canal. The correct option among all the options given in the question is option "d". He was appointed the chief engineer of the Panama project by President Roosevelt on 26th of February in the year 1907. Goethals was absolutely determined in seeing through the job that was handed over to him by the President.
The answer is B.) They discovered the rosetta stone in July 1799
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American colonial settlement could expand westward
A/ Soviet Union is the answer