Oh, yes, I have been there. Lovely monument. Early in its history Maryland was dedicated to freedom of religion.
The Toleration Act was passed in 1649 at St. Mary’s City:
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Maryland’s gift to the common cause was this Act Concerning Religion— one of the pioneer statutes passed by the legislative body of an organized colonial government to guarantee any degree of religious liberty. Specifically, the bill, now usually referred to as the Toleration Act, granted freedom of conscience to all Christians.
http://msa.maryland.gov/msa/speccol/sc2200/sc2221/000025/html/intro.html
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Unfortunately, Jews were not afforded protection under this law, but it was a start....