Here you can find the links to the teacher certification requirements for the 50 States of USA.
A site "made up of current and past educators and individual from different industries who share a common interest in advancing the field of education through spreading the often times nebulous information of teh certification process for teachers and administrators. Go to the site
Teacher Certification for Foreign-Educated Teachers A useful link with clear information for non-US citizens that would like to teach in USA Schools.
ACTFL: States Using ACTFL Assessment: List of states that are using Official ACTFL testing in foreign languages for some component of their teacher certification process. These states have established a formal testing protocol with the ACTFL Testing Office, LTI, to assess teacher candidate speaking and writing proficiency. The minimal level of proficiency is established by the individual state
Teacher Certification Requirements in each US State