  A perturbative expansion for QED and QCD bound states is formulated in
$A^0=0$ gauge. The constituents of each Fock state are bound by their
instantaneous interaction. In QCD an O($\alpha_s^0$) confining potential arises
from a homogeneous solution of Gauss' constraint. The potential is uniquely
determined by the QCD action, up to a universal scale. The Cornell potential is
reproduced for quarkonia, and corresponding ones found for higher Fock states,
baryons and glueballs.
