Voters in Quebec on Monday selected a relatively new center-right party to take control of the provincial government, in the first election campaign in decades that was not defined by the question of whether Quebec should secede from Canada.

The Coalition Avenir Québec, or the C.A.Q., which was founded in 2011, presented itself as neither favoring the current arrangement with Canada, which is the position of the Quebec Liberal Party, nor breaking away from Canada, which the Parti Québécois had long favored.

Instead François Legault, the party’s leader, describes the party’s approach as “nationalism,” which he defines as putting Quebec’s interests first while remaining in Canada.

Unofficial returns indicate that the C.A.Q. captured 73 of the legislature’s 125 seats, a decisive victory that was not forecast by public opinion polls. It means that Quebec will not be governed by a Liberal or Parti Québécois government for the first time since 1966.