  This is the second of a series of three papers treating light baryon
resonances up to 3 GeV within a relativistically covariant quark model based on
the three-fermion Bethe-Salpeter equation with instantaneous two- and
three-body forces. In this paper we apply the covariant Salpeter framework
(which we developed in the first paper) to specific quark model calculations.
Quark confinement is realized by a linearly rising three-body string potential
with appropriate spinorial structures in Dirac-space. To describe the hyperfine
structure of the baryon spectrum we adopt 't Hooft's residual interaction based
on QCD-instanton effects and demonstrate that the alternative
one-gluon-exchange is disfavored phenomenological grounds. Our fully
relativistic framework allows to investigate the effects of the full Dirac
structures of residual and confinement forces on the structure of the mass
spectrum. In the present paper we present a detailed analysis of the complete
non-strange baryon spectrum and show that several prominent features of the
nucleon spectrum such as e.g. the Roper resonance and approximate ''parity
doublets'' can be uniformly explained due to a specific interplay of
relativistic effects, the confinement potential and 't Hooft's force. The
results for the spectrum of strange baryons will be discussed in a subsequent
paper.
