Question 1
The growth of the U.S. economy in the twentieth century depended on __________.
A) the colonization of much of Asia and Africa
B) low population growth rates
C) the consumption of ever-increasing amounts of energy
D) the creation of a perpetual state of war
Question 2
Between 1900 and 2015, the population of the United States __________.
A) declined by 20 percent
B) doubled
C) quadrupled
D) increased tenfold
Question 3
Over the course of the twentieth century, commercial logging eliminated all but __________. percent of the old-growth forests in the United States.
A) 3
B) 11
C) 19
D) 24
Question 4
The key factor in ecological transformation between 1900 and 2000 was __________.
A) population growth
B) rising sea levels
C) a mini ice age
D) genetic mutation