Answer:
Environmental instability may have been a factor not only in shaping adaptations but also in contributing to the extinction of some lineages. Environmental variability associated with the extinction of large mammal species has been proposed for the southern Kenya region.
The history of the United States from 1865 until 1918 covers the Reconstruction Era, the Gilded Age, and the Progressive Era, and includes the rise of industrialization and the resulting surge of immigration in the United States. This article focuses on political, economic and diplomatic history.
This period of rapid economic growth and soaring prosperity in the North and the West (but not in the South) saw the U.S. become the world's dominant economic, industrial and agricultural power. The average annual income (after inflation) of nonfarm workers grew by 75% from 1865 to 1900, and then grew another 33% by 1918.
