Assigned ID: 1024 ----- Attempting Submission 1 (Sat Feb 25 00:42:55 GMT 2012) ----- We propose to uniformly derive the star formation histories (SFHs) of the LMC and SMC from 122 deep archival WFPC2 fields. The large number of extremely deep HST-based CMDs and our uniform approach to analysis will result in constraints the SFHs of both systems to ~ 10\% at all ages. From the HST archive, we have selected 97 fields in the LMC and 25 in the SMC were originally largely observed with other original science goals. Each CMD extends several magnitudes below the oldest main sequence turnoff, providing excellent leverage on the ages of older populations in both systems. Current state of the art SFHs of the LMC and SMC are derived from spatially comprehensive, but unavoidably shallow ground based photometry that does not include main sequence stars older than 5 Gyr, severely compromising the accuracy of the SFHs older than this time. Conversely, existing HST-based SFHs are well-constrained at all ages, but limited to small sets of pointings, inhibiting galaxy wide generalizations. The lack of well-constrained SFHs of the SMC and LMC at all ages, significantly reduces their utility in discriminating between new dynamical models of the SMC and LMC. The results of our study will provide precise constraints on LMC and SMC formation and evolutionary scenarios over all cosmic time. RESOLVED STELLAR POPULATIONS 12 Medium false 0.0 0.0 false false false false SUPPORTED