Shipping zones

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Hi, I have a question. I’m setting up my page and the default shipping zones that Shopify brings I deleted accidentally. Nonetheless, I created 2 shipping zones 1 for U.S. and 1 for international. After I did that, when you go to checkout on my page in the drop down selection for country. They’re all mixed together by alphabetical order and United States is all the way down on the list. I included pictures of other websites (that’s how I want mines to look) where United States, Australia, Canada and United Kingdom - show up as the top 4 options. How can I make my checkout look like this?  I appreciate all the help thanks!