During this half-century Britain was under the rule of the Whig oligarchy, which had no clearly conceived ideas on imperial policy. Under the influence of the mercantile class the Whigs increased the severity of the restrictions on colonial trade, and prohibited the rise of industries likely to compete with those of the mother-country. But under the influence of laziness and timidity, and of the desire quieta non movere, they made no attempt seriously to enforce either the new or the old restrictions, and in these circumstances smuggling trade between the New England colonies and the French West Indies, in defiance of the Navigation Act and its companions, grew to such dimensions that any serious interference with it would be felt as a real grievance. The Whigs and their friends later took credit for their neglect. George Grenville, they said, lost the colonies because he read the American dispatches; he would have done much better to leave the dispatches and the colonies alone. But this is a damning apology. If the old colonial system, whose severity, on paper, the Whigs had greatly increased, was no longer workable, it should have been revised; but no Whig showed any sign of a sense that change was necessary. Yet the prevalence of smuggling was not the only proof of the need for change. There was during the period a long succession of disputes between colonial governors and their assemblies, which showed that the restrictions upon their political freedom, as well as those upon their economic freedom, were beginning to irk the colonists; and that self-government was following its universal and inevitable course, and demanding its own fulfilment. But the Whigs made no sort of attempt to consider the question whether the self-government of the colonies could be increased without impairing the unity of the empire. The single device of their statesmanship was--not to read the dispatches. And, in the meanwhile, no evil results followed, because the loyalty of the colonists was ensured by the imminence of the French danger. The mother-country was still responsible for the provision of defence, though she was largely cheated of the commercial advantages which were to have been its recompense.