To put bilingual education in the United States into a broader historical context, study this brief history of the subject, which traces the movement back to the middle of the 18th century.
Interested in doing more research about bilingual education, but not sure where to start looking? This directory at Google.com should give you some ideas.
If you'd like some starting points to research governmental and academic aspects of bilingual education, this "Electronic Textbook" will help you on your way.
Looking for a way to narrow a research topic? The National Clearinghouse for English Language Acquisition's website offers detailed information about state resources and school policies.