Hi littlesteps, and welcome to the HOD Board!

Molly already gave such a helpful, wise response that I am nodding along with it.

The books HOD chooses really shine because of the life lessons they teach with Christ at the center, not because some of them happen to be about Americans. But, I can understand what you are saying here! Would you mind sharing what country you call home? Maybe others would come forward with thoughts then. Also, could you share a little about your dc's ages and placement(s)? That would help us try to give some more guide and age specific advice.
But, in general, you can choose any DITHOR books you wish as long as they match the genre being studied, and with some of the guides, the Storytime part of the plans (i.e. Basic Pkg. usually) is genre- based, and these titles could also be chosen. For the extensions, those books are only used if your child falls in the extension age range for a guide. They parallel the theme of each unit being studied so nicely, I think I'd use them as is if you happen to have a student in the extensions age range. As far as using the Basic and/or extension, that depends on the guide you are talking about and the child's needs. If you get the chance to share a bit more, we will all chime in to help you out as best we can! I will say I help with the training of the shipping in HOD one day a week, and HOD is being shipped about everywhere you can imagine - very exciting to see the Lord at work in this way!!! So, just know you are not alone in being from a different country than America and using HOD! Looking forward to getting to know you here!
In Christ,
Julie