1721
Harvard Hall burns down, destroying John Harvard's library--save one book.
1764
The Revolutionary War Cambridge approves, participates.
1775
Massachusetts constitutional convention meets at Cambridge meeting house.
1779
Andrew Craigie builds Canal Bridge in East Cambridge.
1807
Coeducation begins in Cambridge public schools.
1845
City charter adopted.
1846
Railroad line opens through the city.
1850
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