The 1960s was a decade of swift change in terms of both politics and technology, and Canada's monarch found herself affected by both; for instance, Elizabeth II inaugurated the first trans-Atlantic telephone cable—part of one laid to link all the Commonwealth countries—when she, at Buckingham Palace, called Prime Minister Diefenbaker, who was at the Château Laurier. However, the Queen's success in the other field was not as guaranteed; shifts were taking place in Canadian identity, due, in part, to the establishment of multiculturalism as an official policy, increased immigration from beyond the British Isles, and Quebec separatism, the latter becoming the major impetus of political controversy over the Crown.