North Dakota has experienced one of the highest population growth rates in the United States in the recent past due to an oil boom. Which demographic variable explains this?

A) fertility
B) migration
C) mortality
D) life span

Population Growth

Population growth is the increase in the number of individuals in a population, often measured by the birth rate minus the death rate plus net migration.

Oil Boom

A period of significant economic growth due to the discovery or exploitation of oil resources.

Migration

Movement of people from one geographic area to another for the purpose of resettling.