Any person who is not at least 7/8 white aka Indo-European or Caucasian, as long as the other
1/8 does not include black aka Sub-Saharan African. But may include East Asian and/or Native American aka
Amerindian.
Any person who is not at least 15/16 white, if the other 1/16 includes black. Although the "
one drop" rule includes any black ancestry, it is difficult to enforce after five generations, especially if the black ancestor is not straight maternal.
People of color include blacks, Asians, and Native Americans.
Homer
Plessy was 1/8 black and therefore had to use "colored" facilities in the Segregated South. Mr. Plessy was a Person of Color.
Thomas Jefferson's slave concubine was 3/4 white, but since her maternal grandmother was black and a slave, she was also a black slave. The children that she bore with Jefferson were 7/8 white, but they were
legally black slaves.
"Color" is rinsed after five generations if it is black and four generations if it is Asian and/or Native American.