I understand why this is happening in Africa first — lack of infrastructure makes the solution much more competitive. But as prices fall, it seems that this might be cost competitive in other areas as well. Selfishly, I’d love to see this in the US! Any big issues that would prevent adoption in the US?

It's mostly politics stopping this in the US. But even with current political roadblocks to solar, it's an absolutely massive part of new builds for grid scale electricity generation:

https://www.eia.gov/todayinenergy/detail.php?id=65964

I'm sure you can think of one at the moment.