Lord Metcalfe's successor was Lord Cathcart, who had served with distinction in the Peninsular War, and was appointed with a view to contingencies that might arise out of the dispute between England and the United States on the Oregon boundary question, to which I shall refer in another chapter. He pursued a judicious course at a time when politics were complicated by the fact that the industry and commerce of the country were seriously deranged by the adoption of free trade in England, and the consequent removal of duties which had given the preference in the British market to Canadian wheat, flour and other products. What aggravated the commercial situation was the fact that the navigation laws, being still in force, closed the St. Lawrence to foreign shipping and prevented the extension of trade to other markets so as to compensate Canadians for the loss of that with the parent state. Lord Cathcart was recalled within less than a year, when all prospect of war with the United States had disappeared, and was followed (1847) by a civil governor, the Earl of Elgin, who was chosen by the Whig ministry, in which Lord John Russell was prime minister, and Earl Grey the secretary of state for the colonies. It had dawned upon English statesmen that the time had come for giving the colonists of British North America a system of responsible government without such reserves as had so seriously shackled its beginnings. In all probability they thought that the free-trade policy of England had momentarily weakened the ties that had bound the colonies to the parent state, and that it was advisable to follow up the new commercial policy by removing causes of public discontent in the province. Lord Elgin was happily chosen to inaugurate a new era of colonial self-government. Gifted with a judicial mind and no ordinary amount of political sagacity, able to originate as well as carry out a statesmanlike policy, animated, like Lord Durham--whose daughter he had married--by a sincere desire to give full scope to the aspirations of the people for self-government, so far as compatible with the supremacy of the crown, possessed of eloquence which at once charmed and convinced, Lord Elgin was able to establish on sure foundations the principles of responsible government, and eventually to leave Canada with the conviction that no subsequent representative of the crown could again impair its efficient operation, and convulse the public mind, as Lord Metcalfe had done. On his arrival he gave his confidence to the Draper ministry, who were still in office; but shortly afterwards its ablest member was elevated to the bench, and Mr. Sherwood became attorney-general and head of a government, chiefly interesting now for the fact that one of its members was Mr. John Alexander Macdonald, who, on becoming a member of the assembly in 1844, had commenced a public career which made him one of the most notable figures in the history of the colonial empire of England.