[ilarum]

You don't need to leave the United States to renew your passport. Your country's embassy in the US can do it for you.

[sushshshsh]

Not the Chinese one apparently

[oskapt]

This is true. My wife has renewed her Russian passport from Poland and from Chile, as well as from within the United States.

[dodobirdlord]

Whether you can renew a passport from outside of the country differs between countries.