The pre-1890 expansion period in the US was marked by economic expansion (expansionism) fueled by, industrial growth, demand for fertile land, economic opportunities, and used economic policies after the closure of the revolutionary war while the post-1890 American expansion (19th C) was marked by imperialism, military expansion and formulation of policies to increase US powers, i.e. US signed a treat with China to gain diplomatic and trade relations resulting in the US taking over the Pacific ports.
Answer:
a system of classes that were organized like a pyramid
Explanation:
In Addition to the Inca social system, the Aztecs had landless serfs and slaves. Therefore, the Pyramid like structure that existed in the society was the common feature of both the Empires.
Be more specific? Tell me which nations you're learning about?
The answer to your question would have to be the discovery of coal
