Because they are not perfect and act like humans.
Isolation.
They tried to stay out of the line of fire, letting the Europeans run rampid about, as they tried to fix their own problems. Continually point fingers at U.S, trying to get them to act. U.S eventually got dragged in, due to the fact that Japan had attacked the United states.
The correct answer is - C. 1975 - 1999.
The period between 1975 and 1999 was a period in which the world population grew for around 2 billion people. Even thought that is the same rise as in the period between 1930 and 1975, still this period is shorter, and is just 24 years the world population grew from approximately 4 billion people to approximately 6 billion people.
