Why can't I use text-center on Bootstrap 4?

<div class="container">
  <div class="jumbotron">
    <div class="row">
      <div class="col-xs-12">
        <h1 class="text-center-xs">Joseph Santoni</h1>
      </div>
    </div>
  </div>  
</div>

The text is not centring at all.

This is Bootstrap 3 syntax, not BS4.

I suggest review the docs on what classes you can use for BS3 or BS4.

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