The <a href="https://en.wikipedia.org/wiki/Centennial_Exposition" id="mw2g" rel="mw:WikiLink" title="Centennial Exposition">Centennial Exposition</a> is opened in <a href="https://en.wikipedia.org/wiki/Philadelphia" id="mw2w" rel="mw:WikiLink" title="Philadelphia">Philadelphia</a>.<sup about="#mwt141" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-24"}}' id="cite_ref-24" rel="dc:references" typeof="mw:Extension/ref"><a href="./May_10#cite_note-24" id="mw3A" style="counter-reset: mw-Ref 24;"><span class="mw-reflink-text" id="mw3Q">[24]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-24"><cite about="#mwt138" class="citation web cs1" id="mwBxs"><a class="external text" href="https://www.britannica.com/event/Philadelphia-Centennial-Exposition" id="mwBxw" rel="mw:ExtLink nofollow">"Philadelphia Centennial Exposition | trade fair, Philadelphia, Pennsylvania, United States"</a>. <i id="mwBx0">Encyclopedia Britannica</i><span class="reference-accessdate" id="mwBx4">. Retrieved <span class="nowrap" id="mwBx8">14 May</span> 2020</span>.</cite><span about="#mwt138" class="Z3988" id="mwByA" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=Encyclopedia+Britannica&amp;rft.atitle=Philadelphia+Centennial+Exposition+%7C+trade+fair%2C+Philadelphia%2C+Pennsylvania%2C+United+States&amp;rft_id=https%3A%2F%2Fwww.britannica.com%2Fevent%2FPhiladelphia-Centennial-Exposition&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMay+10"></span></span>