JSFiddle - React, Tailwind, and code Playground
HTML
<select id="1">
<option value="1">Val 1</option>
<option value="2">Val 2</option>
<option value="3">Val 3</option>
</select>
<select id="2">
</select>
JavaScript
$(document).ready(function(){
$("#2").append($('#1').html());
$("#2 option").each(function(){
$(this).text($(this).val());
});
});