This time last year, Christine Sherrill was teaching fifth graders American history in Kenosha, Wis.

Now she’s making Broadway history.

The 54-year-old actress and teacher is playing Donna in “Mamma Mia!” at the Winter Garden Theatre.

When she got the news she’d landed the role, she had just finished teaching a unit on the American Revolution, where she used the musical “Hamilton” as source material.

“I had a lot of boys in my classroom and they were all athletes. So when I introduced ‘Hamilton’ to them, I was like, ‘This is going to be a chore.’ And they were glued,” Sherrill told The Post. 3

“I would get feedback from parents being like, ‘I’ve never heard my kids sing before and we’re making dinner and they know all the ‘Hamilton’ lyrics.'”

So when she announced to the class

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