France now overshadowed Holland as England's chief competitor. Canada, originally colonized by the French, had been conquered by the English in 1629, but speedily restored by Charles I; and towards the close of the seventeenth century France began to think of uniting Canada with another French colony, Louisiana, by a chain of posts along the Mississippi. Colbert, Louis XIV's minister, had greatly developed French commerce, navy, and navigation; and the Mississippi Company was an important factor in French history early in the eighteenth century. This design, if successful, would have neutralized the advantage England had secured in the possession of the Atlantic seaboard of North America, and have made the vast West a heritage of France. Nevertheless, the wars of William III and Anne were not in the main colonial. Louis' support of James II, and his recognition of the Old Pretender, were blows at the heart of the empire. Moderate success on James's part might have led to its dismemberment, to the separation of Catholic Ireland and the Scottish Highlands from the remainder of the British Isles; and dominion abroad would not long have survived disruption at home. The battle of the Boyne (1690) disposed of Irish independence, and the Act of Union with Scotland (1707) ensured Great Britain against the revival of separate sovereignties north and south of the Tweed. Scotland surrendered her independent parliament and administration: it received instead the protection of the Navigation laws, representation in both houses of the United Parliament, and the privilege of free trade with England and its colonies--which put an end to the tariff wars waged between the two countries in the seventeenth century; and it retained its established Presbyterian church. Forty- five Scottish members were to sit in the House of Commons, and sixteen Scottish peers elected by their fellows for each parliament in the House of Lords. Scottish peers who were not thus chosen could neither sit in the House of Lords nor seek election to the House of Commons.