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The most obvious cross-class social relationships of the late 18th century American Colonies were religion and Free Masonry.
The numerous small Protestant sects throughout the colonies, especially in New England, tended to ensure that the congregations were cross-class. In an age of small towns, little official planning, and many distinct churches, it was inevitable that congregations would be mostly multi-class.
Less well known is the strong thread of Free Masonry throughout the Revolution, with many of the Founding Fathers and original Congress Representatives being Masons. Although Paul Revere and William Dawes both set on a midnight ride out to raise the countryside, it is known today as Revere's ride because, through his extensive personal connections, many of them Masonic, he was much more efficient than Dawes at raising the alarm.