The only way for conservatives as a party to regroup was to accept the consequences of responsible government. They abandoned the idea of being the governor's party and embraced mass politics. At the same time the coalition that had won responsible government began to break up in the 1850s. This presented an opening for more moderate conservatives such as John A. Macdonald and George-Étienne Cartier to claim the political centre. Their coalition dominated politics in the United Province of Canada, and when joined by liberal George Brown, provided the broad support necessary to negotiate Confederation with the Maritime Provinces.