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.
The Transcontinental Railroad was also instrumental in putting thousands of people to work, and also they were instrumental in transporting cattle and resources in much more efficient ways.
The last option would be the best answer I think.
Charles Sumner, who was a Massachusetts senator in the U.S. government, died in 1874. He actively worked towards movements that would assist slaves in the south before, during and after the war. In the years leading up to his death, he and his colleagues continued to lobby for better rights for the African-Americans in the South.
Answer:
Advancement in mapmaking and navigational techniques is the one among the following choices given in the question that helped to bring about European global exploration during the 15th to 18th centuries. The correct option among all the options given in the question is the fourth option or option "d".
Explanation:
