 Diefenbaker's decision to have Canada remain outside the OAS was not reversed by Pearson, and it was not until 1989, under the Tory government of Brian Mulroney, that Canada joined.But several defining features of modern Canada can be traced back to Diefenbaker.Diefenbaker's Bill of Rights remains in effect, and signalled the change in Canadian political culture that would eventually bring about the Canadian Charter of Rights and Freedoms, which came into force after his death.