Population growth in the United States and Canada.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002170:Canada; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D008017:Life Expectancy; D008875:Middle Aged; D011153:Population; D014481:United States