I was at Michigan for my MA related to history (not directly in the department) so I hear from my history professors there.
Statistics for last 2 years (per year)
18-20 spots offered
Likely another 20 people on waitlist.
Many history programs across rankings generally have very low acceptance rates (Less than 15%) for full funding spots due to budget cuts and the vast majority of applicants actually being quite qualified for admissions. Many of them have become more committed to funding students for 4-5 years, making all of this more difficult than if they weren't so concerned about their graduates finishing in a timely manner.