Some of my relatives obtained their Canadian citizenship years after
arriving. Many of their records were destroyed, especially those that
became citizens before 1900.
On the reverse side, a Canadian woman marrying a citizen of another
country lost her Canadian citizenship. My mother married in 1930 to a
US citizen for instance. Since they were not living in the US, but in
Britain, she eventually received a British passport (Canada being
British), until she was naturalized in the US in 1942, three years after
arriving in NY. When they wanted to travel together in 1930 she
received a paper from the US consulate in London identifying her as
married to an American citizen.
West Vancouver, BC