Speaking to her niece, aunt em says sadly, "we can't go against the law, dorothy." which type of word is "can't"?

Modal auxiliary

Explanation:

 There are several auxliiary verbs (the ones that help to form a tense or an expression), and some of them are modal auxialiaries (may, must, will, etc). Can is one of the auxiliary verbs used for permission , possibility, ability, etc. In the sentence "We can't go against the law, Doroty.", can't is a word that expresses the idea of not having permission, not being allowed.

well, there are online sites that can make it look like a texting screenshot, so u can make it like hamilton texting jefferson through that, and he can start with him being like, i know it's out of the blue, but blah blah blah