JSFiddle - React, Tailwind, and code Playground

HTML

<h4>Country</h4>
  <select name="filter_country" id="filterCountryId">
    <option></option>
    <option >argentina</option>
    <option>australia</option>
    <option>brazil</option>
    <option>china</option>
    <option>germany</option>
    <option>japan</option>
    <option>newzealand</option>
    <option>russia</option>
    <option>southafrica</option>
    <option>uk</option>
    <option>uruguay</option>
    <option>us</option>
    <option>usa</option>
  </select>

JavaScript

$('#filterCountryId').on('change', function() {
         alert( this.value ); // or $(this).val()
       });