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We observed six fields of the Small Magellanic Cloud (SMC) with the AdvancedCamera for Survey on board the Hubble Space Telescope in the F555W and F814Wfilters. These fields sample regions characterized by very different star andgas densities, and, possibly, by different evolutionary histories. We find thatthe SMC was already forming stars ~12 Gyr ago, even if the lack of a clearhorizontal branch suggests that in the first few billion years the starformation activity was low. Within the uncertainties of our two-bandphotometry, we find evidence of a radial variation in chemical enrichment, withthe SMC outskirts characterized by lower metallicity than the central zones.  From our CMDs we also infer that the SMC formed stars over a long interval oftime until ~2-3 Gyr ago. After a period of modest activity, star formationincreased again in the recent past, especially in the bar and the wing of theSMC, where we see an enhancement in the star-formation activity starting from~500 Myr ago. The inhomogeneous distribution of stars younger than ~100 Myrindicates that recent star formation has mainly developed locally.

Star Formation History of the SMC: six HST/ACS