the Bronfman family, from different ethnic backgrounds. Similarly to the Canadiens of the Ancien Régime a century before, the Square Milers with their old-fashioned British ideals and business principles did not adapt to the changes in society and held themselves aloof. Newcomers, who neither knew nor cared about the old guard and their traditions were more often than not barred from entry into Square Mile society (such as membership to Montreal's most prestigious men's club, the Mount Royal), but this only served to further alieniate the declining enclave. Changing attitudes, the war, the introduction of income tax and the invasion of commerce in the streets below Sherbrooke all played their part in the decline. The Wall Street Crash of 1929 affected a great number of Square Milers, though not as badly as it did their American counterparts. Art collections were sold and some tried to sell their houses, but there were no takers. The J.K.L. Ross House was sold for $50,000 in 1930, only a few years after it had been valued at $1 million. Those who had relied on investments moved to smaller, more heat-efficient houses in Westmount or took apartments at the Ritz-Carlton Montreal, whereas others like Sir Herbert Samuel Holt, who never dealt on margin, emerged untouched. The Great Depression in Canada during the 1930s fueled the Quebec nationalist movement and set the course for the Quiet Revolution. The social divide between anglophones employers and French Canadian workers in Quebec had existed for a long time, but the economic turmoil of the Great Depression led to calls for change from the status quo. For the next four decades the Union Nationale government, with the support of the Catholic Church, dominated Quebec politics, undermining anglophone domination. In 1977, the newly elected Parti Québécois (PQ) government passed the Charter of the French Language (known as Bill 101), making the use of French language mandatory for medium and large-scale companies when communicating with French-speaking staff. This law, the election of the PQ, and the threat of Quebec independence caused instability in the province's business environment, and accelerated the move of some companies' headquarters from Montreal to other Canadian cities, including Calgary and Toronto. Some companies remained in Montreal, including the Montreal Exchange North America's oldest brewery, Molsons, but others moved their headquarters elsewhere, such as the Bank of Montreal, Sun Life Financial, the Royal Trust and The Guarantee Company of