The ornamental design for: African American flag, as shown and described.
FIG. 1 is a front elevational view of an African American flag showing my new design the opposite side being a mirror image thereof and color being depicted schematically;
FIG. 2 is a bottom edge view thereof, the top edge view being identical thereto; and,
FIG. 3 is a right edge view thereof, the left edge being identical thereto.