Carter Hall isn't POC. He started as a blonde white man.
Post Crisis Katar Hol before Johns was half Thanagarian (via Paran Katar) and half Cherokee (via Naomi Carter). That Hawk was POC.
Earth 2 Hawkgirl (New 52) was definitely POC.
(Always found it interesting that the Thanagarian Hawks in DCAU were voiced mostly by Latina and Latino actors.)