The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Canadian_Citizenship_Act_1946" id="mwAg4" rel="mw:WikiLink" title="Canadian Citizenship Act 1946">Canadian Citizenship Act 1946</a> comes into effect, converting <a href="https://en.wikipedia.org/wiki/British_subject" id="mwAg8" rel="mw:WikiLink" title="British subject">British subjects</a> into <a href="https://en.wikipedia.org/wiki/Canadian_nationality_law" id="mwAhA" rel="mw:WikiLink" title="Canadian nationality law">Canadian citizens</a>.<sup about="#mwt325" class="mw-ref reference" data-mw='{"name":"ref","attrs":{"name":"Senate1952"},"body":{"id":"mw-reference-text-cite_note-Senate1952-63"}}' id="cite_ref-Senate1952_63-0" rel="dc:references" typeof="mw:Extension/ref"><a href="./January_1#cite_note-Senate1952-63" id="mwAhE" style="counter-reset: mw-Ref 63;"><span class="mw-reflink-text" id="mwAhI">[63]</span></a></sup> Prime Minister <a href="https://en.wikipedia.org/wiki/William_Lyon_Mackenzie_King" id="mwAhM" rel="mw:WikiLink" title="William Lyon Mackenzie King">William Lyon Mackenzie King</a> becomes the first Canadian citizen.