Which part don't you understand? The US Constitution isn't written in anything more than common academic English of the 18th century, it's not even written in 18th century English legalese (seriously, you can look up contracts and the like from the 18th century, it's not quite modern Legalese, but it's a far cry from how the US Constitution was written). Sure, some of the language is slightly archaic due to being written, well, 250ish years ago and languages shift, but it's still completely understandable.I don't understand the constitution
Or is your lack of understanding more esoteric, in the sense you don't understand the reason and purpose behind the various parts of it? If it's the second, I'd be more than happy to break down just about any part of it and explain the underlying history behind it.