Rick Santorum greatly overreached when he claimed that Congress required “English be the principal language and that it be taught and spoken universally” in several Southwest territories, Oklahoma and Hawaii as preconditions for them attaining statehood.
Congress did require in some cases that new states conduct government business in English, or that public schools teach in English. But those were the limits of the requirements. There were no requirements that English be the “principal language” or that it be “spoken universally.”