PARIS -- To reach Virginie and Ronnie's apartment, located in a working-class district near Paris's Gare du Nord station, you need to climb a narrow, endless spiral staircase. At the very top, under the eaves, their tiny living area has peeling paint and rising dampness. Given the space, the visitor can hardly fail to notice the three posters the tenants have hung on the walls. A breath of fresh air in these dank surroundings, they portray the wide open spaces of Quebec through the seasons. The slogan "Faire sa vie au Québec" ("Make Your Life In Quebec") is splayed across the posters. It's a new mantra for this...