This juvenile bird hasn't gotten its white eyes yet, and has recently molted most of its tail feathers.
I thought this bird could have been a Bell's Vireo, but it lacks the thin dark line through the eye and has more obvious wing bars. It's an immature White-eyed.
The White-eyed Vireo (Vireo griseus) is a small songbird. It breeds in the southeastern USA from New Jersey west to northern Missouri and south to Texas and Florida, and also in eastern Mexico, northern Central America, Cuba and the Bahamas.