Automatically show State select and US country?

During checkout you can select a country, then based on that it unhides a State/Province <select> if required. How do I always show the Country on US, and the State select to automatically be visible? Changing the value to 'US' in class-mp-checkout.php on about line 427 will auto-select US, but then the State select isn't showing. How do I always show the State <select> too?