The correct answer is dictatorship. The reason for this is because in a dictatorship, both the executive and legislative branches are controlled by the leader. Hope this helps.
Answer:
Climate change, Availability of resources
Explanation:
1. Soon enough when the climate on the planet started to become more arid and become too hot, so humans started to migrate from Africa.
2. People started to move away to the places where resources were available.
The railroad boosted the economic status of the USA the transportation of raw materials and manufactured good to and from industries became faster and easier after the completion of the railroad
The answer is c.empire and republic
