I question whether Mexican American/Latino history is covered in detail in any regular American history course. In Texas, it is probably covered more than most because the kids are required to take Texas history numerous times but the majority of coverage is the war between Mexico and the US for the Texas territory. This textbook was for a new elective class that would offered to HS students. @Hanna may be right in saying that the textbook was so slanted and incorrect to be uncorrectable with the result being this class would not offered at least for now.