The Rights of Man footnote 25
In America the increase of commerce is greater in proportion than in England. It is, at this time, at least one half more than at any period prior to the revolution. The greatest number of vessels cleared out of the port of Philadelphia, before the commencement of the war, was between eight and nine hundred. In the year 1788, the number was upwards of twelve hundred. As the State of Pennsylvania is estimated at an eighth part of the United States in population, the whole number of vessels must now be nearly ten thousand.
Thomas Paine homepage