At the <a href="https://en.wikipedia.org/wiki/1961_Commonwealth_Prime_Ministers'_Conference" id="mw_A" rel="mw:WikiLink" title="1961 Commonwealth Prime Ministers' Conference">1961 Commonwealth Prime Ministers' Conference</a>, South Africa announces that it will withdraw from the Commonwealth when the <a href="https://en.wikipedia.org/wiki/South_African_Constitution_of_1961" id="mw_Q" rel="mw:WikiLink" title="South African Constitution of 1961">South African Constitution of 1961</a> comes into effect.<sup about="#mwt162" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-31"}}' id="cite_ref-31" rel="dc:references" typeof="mw:Extension/ref"><a href="./March_15#cite_note-31" id="mw_g" style="counter-reset: mw-Ref 31;"><span class="mw-reflink-text" id="mw_w">[31]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-31"><cite about="#mwt159" class="citation book cs1" id="CITEREFHarrison1983">Harrison, David (1 October 1983). <a class="external text" href="https://books.google.com/books?id=LgwWMUbyNVUC&amp;pg=PA166" id="mwCLE" rel="mw:ExtLink nofollow"><i id="mwCLI">The White Tribe of Africa</i></a>. University of California Press. p.<span id="mwCLM" typeof="mw:Entity"> </span>166. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwCLQ" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwCLU" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-520-05066-2" id="mwCLY" rel="mw:WikiLink" title="Special:BookSources/978-0-520-05066-2"><bdi id="mwCLc">978-0-520-05066-2</bdi></a>.</cite><span about="#mwt159" class="Z3988" id="mwCLg" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+White+Tribe+of+Africa&amp;rft.pages=166&amp;rft.pub=University+of+California+Press&amp;rft.date=1983-10-01&amp;rft.isbn=978-0-520-05066-2&amp;rft.aulast=Harrison&amp;rft.aufirst=David&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DLgwWMUbyNVUC%26pg%3DPA166&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMarch+15"></span></span>