You will be assigned randomly to either East or West region.
As long as you are a current student at a middle school / high school in US and/or Canada, you can apply, regardless of your passport or citizenship.
If you are a US or Canada citizen studying aboard, you can also apply.
Otherwise, we do not take other international applicants. This is mainly a US / Canada competition.
The 2022 national final will be held either online or at San Jose, CA, heart of Silicon Valley. It is TBD.