[jQuery] code review for short snippet

[John H]

I'm not new to web development or javascript, but am relatively new to
jQuery. I'm wondering if someone would be willing to quickly review
the following code for efficiency and best practices. The function
works as required, but I'd like to take this as a learning
opportunity.

In a nutshell the code initially hides two divs onload and then the
function shows/hides the state/province divs depending on the value of
the country dropdown. I want to keep the code readable, but I know it
could be tighten up.

The state/province divs have a style attribute to initially hide them.
Exp. style="display: none;"

Questions:

1) Can the duplicate show/hide methods be reduced?
2) What about checking for the existence of the state/province
dropdowns? (I know they're always going to be there because of the
context of the page, but want to know what the best practice is.)

    $(document).ready(function() {
      // set default div visibility
      if ($('#edit-profile-country').val() == 'US') {
        $('#state').show();
      }
      if ($('#edit-profile-country').val() == 'CA') {
        $('#province').show();
      }
      $('#edit-profile-country').change(function() {
        $('#state').hide();
        $('#province').hide();
        if ($(this).val() == 'US') {
          $('#state').show();
        }
        if ($(this).val() == 'CA') {
          $('#province').show();
        }
      })
    });