$(document).ready(function() {
    $('.expandButton').click(function() {
         $('.expandableSection').toggle("slide");
    });
});

<div class="expandableSection">
   <h1 class="expandButton"></h1>
</div>
<div class="expandableSection">
   <h1 class="expandButton"></h1>
</div>
<div class="expandableSection">
   <h1 class="expandButton"></h1>
</div>
<div class="expandableSection">
   <h1 class="expandButton"></h1>
</div>