How much do high school social studies teachers make with a masters degree?

Depends on the state, the school district. There is no set wage for teachers and it can vary between school districts as little as2 or 3 miles apart. Teachers are paid by experience, number of college units, credentials held, and degrees. If a new teacher with a MA/MS starts teaching he or she will not make the same salary as an experienced teacher with no Masters. Some districts don't pay teachers for advanced degrees. Some states pay teachers more than other states. The base starting salary for a new teacher in CA is around 35,000.00 a year. When I began teaching 26 years ago my first salary was 17,000.00 a year, so the base pay has gone up.