What effect did the standard gauge have on railroad lines? a. it allowed an engineer to stop all cars on a train at once. b. it allowed railroads to form a cross-country network. c. it converted some railroad cars into “hotel rooms on wheels.” d. it allowed railroads to carry freight as well as passengers.

How did southern slaveholders attempt to convince people in the north to support slavery?

All of the following changes typically happened in colonies as a result of imperialism, except: a. cultural practices were outlawed. b. they became more economically self-sufficient. c. european nations built modern infrastructure, including railways. d. the european language became the language of government and education.

Which directions did the mongols travel as they swept across asia and europe