The source code for nginx is hosted in the US, BSD-licensed and has the american F5.com as the primary maintainer, sponsor, and steward of NGINX.
In 2022 some of the developers forked it into Angie, the code of which is hosted in the US as well.
In 2024 one of the lead developers forked nginx into freenginx due to F5’s interference, bringing it more in line with its initial grassroots origin. They have a self-hosted Mercurial repo (and a mirror in the US) and the domain seems to be controlled by the lead developer.
I don’t think it really makes a lot of sense to look for FOSS alternatives based on country of maintainer origin when it’s something popular enough to be shipped by a lot of independent Linux distros and supported by local IT consultants in more or less any country. That said, to my knowledge, lighttpd is mostly German in origin and is actively maintained. It definitively lost to nginx in the great popularity contest but I don’t think it’s really any worse.