Reference 1: Population age 0-14 years old and Population age 15-49 years old.
Reference 2: U.S. 100%, White alone 72.41%, Black alone 12.61%, Mixed* 9.11%, Asian alone 4.75%, American Indian and Alaska Native alone 0.95% and Native Hawaiian and Other Pacific Islander alone 0.17%.
Source: http://en.wikipedia.org/wiki/Racial_and_ethnic_demographics_of_the_United_States
Reference 2: U.S. 100%, White alone 72.41%, Black alone 12.61%, Mixed* 9.11%, Asian alone 4.75%, American Indian and Alaska Native alone 0.95% and Native Hawaiian and Other Pacific Islander alone 0.17%.
Source: http://en.wikipedia.org/wiki/Racial_and_ethnic_demographics_of_the_United_States
