Do you know what subject every high school sports coach gets
his credential in if it isn't P.E.?
Have you heard of supply and demand? Call some credential
programs and ask them what subject most of their students
are trying to earn their credential in. I wonder if the
states post the number of credential holders of different
subjects. What do you think those numbers would look like
for history relative to other secondary subjects...
Add a credential in math. You'll have a job within the month.