Solution:
I have done the same thing previously using add_rewrite_rule.
Try to use this code,
function custom_rewrite_rule() {
add_rewrite_rule(
‘states/([^/]*)/?’,
‘index.php/states/?q=$1’,
‘top’ );
}
add_action(‘init’, ‘custom_rewrite_rule’, 10, 0);
Do not forget to update your permalink after adding this into “function.php” file.
It should work for you. Thanks.