Is my american sweetgum dying or just stressed?

On high-pH soil sweetgum goes chlorotic — pale leaves with green veins — and on a hot, dry, reflective site it will scorch leaf margins brown by August. Stress is scorch or early fall color on a tree that flushes normally the following spring; dying is dieback starting at the top and outer branches, dark weeping streaks on the trunk from bleeding necrosis, and thinning that worsens two or three seasons running.