don't require the "State" field at checkout and hide it

custom_stylesheet.css

.pmpro_checkout-field-bstate {
  display: none;
}

my_pmpro_required_billing_fields.php

function my_pmpro_required_billing_fields($fields)
{
	if(is_array($fields) && isset($fields['bstate'))
	{
		unset($fields['bstate']);
	}
	return $fields;
}
add_action('pmpro_required_billing_fields', 'my_pmpro_required_billing_fields');