need answer ASAP pls

Which is the independent variable in the graph of the U.S. population 1800-1900?

United States
straight lines
years
population

need answer ASAP pls Which is the independent variable in the graph of the US population 18001900 United States straight lines years population class=

Respuesta :

Answer: United States

Step-by-step explanation: Because threats the only independent variable the rest are dependent on others.