(MCB), which raised and stabilized prices through licensing, bonding, and fixed price agreements. The MCB resolved the crisis for the industry, but consumers complained loudly about higher prices. The government favoured producers over consumers as the industry rallied behind the MCB. Following a massive defeat in 1934 by the Liberals, the Conservatives reorganized over the next decade. Led by pragmatic leaders Cecil Frost, George Drew, Alex McKenzie, and Fred Gardiner, they minimized internal conflicts, quietly dropped laissez-faire positions, and opted in favour of state intervention to deal with the Great Depression and encourage economic growth. The revised party declared loyalty to the Empire, called for comprehensive health care and pension programs, and sought more provincial autonomy. The reforms set the stage for a long run of election wins from 1943 onward. Late 20th century After World War II, Ontario grew more in population. The Greater Toronto Area in particular has been the destination of most immigration to Canada, largely immigrants from Europe in the 1950s and 1960s. After changes in federal immigration law in 1967, most immigrants come from Asia. In terms of ancestry, Ontario has changed from a largely ethnically British province, to one that is very diverse. Toronto replaced Montreal as the nation's premier business centre because the nationalist movement in Quebec, particularly with the success of the Parti Québécois in 1976, systematically drove Anglophone business away. Depressed economic conditions in the Maritime Provinces have also resulted in de-population of those provinces in the 20th century, with heavy migration into Ontario. Politics The Ontario Progressive Conservative Party held power in the province from 1943 until 1985 by occupying the political centre and isolating both the Left and Right, at a time when Liberals most often controlled the national government in Ottawa. By contrast the Co-operative Commonwealth Federation (CCF), which rebranded itself as the New Democratic Party (NDP) in 1961, was in the doldrums after the war. Its best showing was in 1948 when it elected 21 MPPs, and formed the official opposition. Purists said its decline resulted from a loss of Socialist purity and abandonment of the founding left-wing principles of the movement and party. They said democratic socialist activity in terms of activism, youth training, and volunteerism was lost in favour of authoritarian political bureaucracy. Moderates said the decline demonstrated the need for cooperation with Liberals. Political scientists said the party lacked the more coherent organizational base