What did Frederick Douglass mean when he said he "regards" the Declaration of Independence? Why does he regard this document even though he is not included in it?

I’m sorry i don’t understand

Eminem dropped out because he failed freshman year 3 times.
johnny depp dropped out to pursue his career as a rock star.
seth rogan dropped out because of his comedy career.
jim carey dropped out to support his family and to pursue acting.
ryan gosling dropped out to be on mickey mouse.
cameron diaz dropped out to be a model.