Answer: railroad officials
Explanation: operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals.
The dust bowl and caused by dieing plants and pestisides
Answer:
The groups that contributed the most to American society and culture were the Native Americans, African Americans, women, and children.
Explanation:
The Spanish took the Indigenous people as slaves and used them for labor. The Spanish could easily take over the indigenous and take their gold and resources etc.. the Spanish had guns and extremely good weapons (at the time) so they can easily take anything they wanted from the Indigenous people and use them as slaves and other horrible things.