?
I have been unable to find the admit rates by major for UC Davis. I would assume if you are at the average UC GPA and SAT/ACT score or above, then you have a good chance for admittance.
The College of Letters and Science doesn’t consider specific major when making admission decisions. They do compare you to other people applying to your division (source: http://admissions.ucdavis.edu/admission/freshmen/fr_selection_process.cfm ). In the case of history, you’re applying to the social science division. I don’t know about specific admit rates for Letters and Science divisions.
In any case, hang tight. Decisions are supposed to be coming out on the 13th (from what I’ve seen people say in the admissions thread). I know it’s a long wait, but it’ll come soon enough!