How did the Conservative Party of Canada’s creation affect the Liberal Party of Canada?

The creation of the Conservative Party of Canada in 2003, through the merger of the Progressive Conservative Party and the Canadian Alliance, significantly altered the political landscape for the Liberal Party of Canada by ending the fragmentation of conservative forces that had previously benefited the Liberals.123

Prior to this merger, the division between the Progressive Conservatives and the Canadian Alliance (and its predecessor, the Reform Party) had allowed the Liberals to maintain parliamentary majorities while receiving less than two-fifths of the national vote. The unification of these groups created a more formidable electoral opponent.231

The impact on the Liberal Party included:
* Loss of Government: The newly united Conservative Party emerged as the official opposition in 2004 and subsequently defeated the Liberals in the 2006 federal election, ending a long period of Liberal governance.134
* Electoral Decline: Following the 2006 loss, the Liberal Party entered a period of decline, culminating in a historic third-place finish in the 2011 federal election.134
* Strategic Pressure: The presence of a unified conservative opposition forced the Liberals to contend with a more cohesive rival, eventually leading to the party's need to rebuild its base under new leadership in the following decade.13