In 1651 originated the policy which caused the American Revolution. That policy was one of taxation, indirect, it is true, but none the less taxation. The first Navigation Act required that colonial exports should be shipped to England in American or English vessels. This was followed by a long series of acts, regulating and restricting the American trade. Colonists were not allowed to exchange certain articles without paying duties thereon, and custom houses were established and officers appointed. Opposition to these proceedings was ineffectual; and in 1696, in order to expedite the business of taxation, and to establish a better method of ruling the colonies, a board was appointed, called the Lords Commissioners for Trade and Plantations. The royal governors found in this board ready sympathizers, and were not slow to report their grievances, and to insist upon more stringent regulations for enforcing obedience. Some of the retaliative measures employed were the suspension of the writ of habeas corpus, the abridgment of the freedom of the press and the prohibition of elections. But the colonists generally succeeded in having their own way in the end, and were not wholly without encouragement and sympathy in the English Parliament. It may be that the war with France, which ended with the fall of Quebec, had much to do with this rather generous treatment. The Americans, too, were favored by the Whigs, who had been in power for more than seventy years. The policy of this great party was not opposed to the sentiments and ideas of political freedom that had grown up in the colonies; and, although more than half of the Navigation Acts were passed by Whig governments, the leaders had known how to wink at the violation of nearly all of them.