Hi,

Your site doesn't show posts in North America because you enter the wrong category slug. The category doesn't have a spacing between the character.

For example, you must fill:

• "north-america" instead of "north america"
• "central-south-america" instead of "center & sourth ameria".

Please read this post to understand how to get category/post/page slug: https://www.wpbeginner.com/beginners-guide/how-to-find-post-category-tag-comments-or-user-id-in-wordpress/

Regards,
PenciDesign.