Some on my team believe this cannot be true, but I'd like a definitive answer.
I have seen, but cannot currently find, an article somewhere showing how to see in logs API Gateway spawning its CloudFront distribution. If someone could show me how to do that, I'd have my answer. (Just answering the question would be OK, too :-)
Thanks!
Thank you Michael for your comments showing me how to do this.
I sent requests to demo APIs in both us-west-1 and us-gov-west-1, and the response headers indicated a cloudfront distribution in front of the API in us-west-1, but not in front of the API in us-gov-west-1. So, my teammates are correct.
No cloudfront distribution for GovCloud-based API-Gateway-generated API's.