"The following month, Germany sunk four more U.S. merchant ships. ... On April 6, 1917, the United States entered World War I. Get a firsthand look at how a new breed of weapons like WMDs, submarines, armored tanks and air attacks changed modern warfare forever in WWI: The First Modern War"
Answer:American and Canadian railroads
Explanation:
At exactly noon on this day, American and Canadian railroads begin using four continental time zones to end the confusion of dealing with thousands of local times. The bold move was emblematic of the power shared by the railroad companies.
Create a government with divided power
Asserter spray plot stout vens
Zheng He was a Chinese explorer who lead seven great voyages on behalf of the Chinese emperor. These voyages traveled through the South China Sea, Indian Ocean, Arabian Sea, Red Sea, and along the east coast of Africa. His seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433.