Thanks 
Well, my main objective was to practice D3 and React, and that was a huge success because I learned a ton while building this app 
Other than that there are still some things that I’m going to work. I got some suggestions in this topic if you want to take a look.
Yes, I’m using:
- world atlas - slightly modified version - I extended their data with some additional properties that I needed
- Wikimedia REST API
- Unsplash
- REST Countries