  We use numerically unbiased methods to show that the one-dimensional Hubbard
model with periodically distributed on-site interactions already contains the
minimal ingredients to display the phenomenon of magnetoresistance; i.e., by
applying an external magnetic field, a dramatic enhancement on the charge
transport is achieved. We reach this conclusion based on the computation of the
Drude weight and of the single-particle density of states, applying twisted
boundary condition averaging to reduce finite-size effects. The known picture
that describes the giant magnetoresistance, by interpreting the scattering
amplitudes of parallel or antiparallel polarized currents with local
magnetizations, is obtained without having to resort to different entities;
itinerant and localized charges are indistinguishable.
