Ah, I don't really think it is the official line.
All of the major subjects will eventually have exams that students must pass according to NCLB. In 2006, the Minnesota Comprehensive Assessment for "Social Studies" was unveiled to teachers. Specific benchmarks for historical knowledge were revealed and students must achieve a passing score on this exam in order to graduate. This is official government approved history. All states that have benchmark standards for students will eventually have the same thing.