D. John Roeblinf - Telephone Switchboard
B - Petroleum
Wood was one of the first energy sources, way before the nineteenth century so you can rule that choice out.
Nuclear Energy is more advanced and closer to the twentieth century so you can also rule that out.
And coal was before petroleum, around mid to late eighteenth century possibly.
Hope this helps!
Answer:
President Roosevelt signed Executive Order 9066 that authorized the Army to evacuate any persons they considered a threat to national security. As a result, over 120,000 Japanese people were forced to relocate to one of ten different internment camps around the United States.Roosevelt signs Executive Order 9066, initiating a controversial World War II policy with lasting consequences for Japanese Americans. The document ordered the removal of resident enemy aliens from parts of the West vaguely identified as military areas.
Answer:
Separation of Powers in the Central Government. One important principle embodied in the U.S. Constitution is separation of powers. To prevent concentration of power, the U.S. Constitution divides the central government into three branches and creates a system of checks and balances
