supplant herself at number-one
... that Mariah Carey was the first singer to supplant herself at number-one on the United States' Pop Songs chart?
... that <a href="./Mariah_Carey" id="mwCFo" rel="mw:WikiLink" title="Mariah Carey">Mariah Carey</a> <i id="mwCFs">(pictured)</i> was the first singer to <b id="mwCFw"><a class="mw-redirect" href="./Artists_with_the_most_number-ones_on_the_U.S._Mainstream_Top_40_chart" id="mwCF0" rel="mw:WikiLink" title="Artists with the most number-ones on the U.S. Mainstream Top 40 chart">supplant herself at number-one</a></b> on the United States' <a class="mw-redirect" href="./Mainstream_Top_40" id="mwCF4" rel="mw:WikiLink" title="Mainstream Top 40">Pop Songs</a> chart?