By 1800, still over 90 percent of the global (and country-level) population lived in rural areas. Urbanization in the United States began to increase rapidly through the 19th century, reaching 40 percent by 1900. By 1950 this reached 64%, and nearly 80% by 2000.
.4 is the answer i just got it right on e2020
This is true, it can be served as a push factor!
I think the stratosphere but I am not positive...i could be wrong
