  We present the first star formation history (SFH) and age-metallicity
relation (AMR) derived from resolved stellar populations imaged with the JWST
NIRCam instrument. The target is the Local Group star-forming galaxy WLM at 970
kpc. The depth of the color-magnitude diagram (CMD) reaches below the oldest
main sequence turn-off with a SNR=10 at M_F090W=+4.6 mag; this is the deepest
CMD for any galaxy that is not a satellite of the Milky Way. We use Hubble
Space Telescope (HST) optical imaging that overlaps with the NIRCam
observations to directly evaluate the SFHs derived based on data from the two
great observatories. The JWST and HST-based SFHs are in excellent agreement. We
use the metallicity distribution function measured from stellar spectra to
confirm the trends in the AMRs based on the JWST data. Together, these results
confirm the efficacy of recovering a SFH and AMR with the NIRCam F090W-F150W
filter combination and provide validation of the sensitivity and accuracy of
stellar evolution libraries in the near-infrared relative to the optical for
SFH recovery work. From the JWST data, WLM shows an early onset to star
formation, followed by an extended pause post-reionization before star
formation re-ignites, which is qualitatively similar to what has been observed
in the isolated galaxies Leo~A and Aquarius. Quantitatively, 15% of the stellar
mass formed in the first Gyr, while only 10% formed over the next ~5 Gyr; the
stellar mass then rapidly doubled in ~2.5 Gyr, followed by constant star
formation over the last ~5 Gyr.
