Maryland is one of the original 13 colonies. Cecil Calvert, 2nd Lord Baltimore, founded Maryland in 1632. Cecil's father, George Calvert, had received a royal charter for the land from King Charles I. The new colony was named after Henrietta Maria, the wife of the king.
On April 28, 1788, Maryland officially became a state in the Union by ratifying the Constitution of the United States.
Source: Maryland at a Glance: Historical Chronology
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Source: Almanac of Maryland