Reagan tribes

Rea-gan tri-be-s

Location and continent (it is highlighted grey)

Flag

The white symbols that looks like bird feet indicates the territories that the reagan tribes manage to get left, center and right (look at map for reference).
The top green means the dense forest and jungle they have seen in the sky above which also explains why the colour is above the blue colour.
Blue background is all the water the humanoid birds normally see when they travel from one area to the next.

Race: Humanoid birds

History overall:
These birds loves the warm jungle weather which is why they explore the world farther than every species.