had repeatedly been re-enacted and enlarged, and from time to time more
efficient provision was made for their enforcement. In the first place,
the Navigation Acts required that all the colonial trade should be carried
on in ships built and owned in England or the colonies. In the second
place, most of the colonial products were included in a list of
"enumerated goods," which could be sent abroad, even in English or
colonial vessels, only to English ports. The intention was to give to
English home merchants a middleman's profit in the exchange of American
for foreign goods. Among the enumerated goods were tobacco, sugar, indigo,
copper, and furs, most of them produced by the tropical and sub-tropical
colonies. Lumber, provisions, and fish were usually not enumerated; and
naval stores, such as tar, hemp, and masts, even received an English
bounty. In 1733 was passed the "Sugar Act," by which prohibitory duties
were laid on sugar and molasses imported from foreign colonies to the
English plantations, Many of these provisions little affected the
continental colonies, and in some respects were favorable to them. Thus
the restriction of trade to English and colonial vessels stimulated ship-
building and the shipping interest in the colonies. From 1772 to 1775 more
than two thousand vessels were built in America.

[Sidenote: Illegal trade.]
[Sidenote: Difficulty of enforcement.]

The chief difficulty with the system arose out of the obstinate
determination of the colonies, especially in New England, to trade with
their French and Spanish neighbors in the West Indies, with or without
permission: they were able in those markets to sell qualities of fish and
lumber for which there was no demand in England. Well might it have been
said, as a governor of Virginia had said a century earlier: "Mighty and
destructive have been the obstructions to our trade and navigation by that