Can one select box's value change another select boxs value?

Can one select box's value change another select boxs value?

I have 2 select boxes, "#Country" and "#StateAbbreviation" if a user selects a country other than USA - .val="USA"  in the #Country select box, I need to change the value in "#StateAbbreviation" to OTHER/INTL. - val="IT"

Why doesn't this work?
$("#Country").change(function() {
    if($(this).val() != 'USA') {
        $("#StateAbbreviation").val() == 'IT';   
    }
});

Kane Leins