Isn't it unconstitutional to make Canada the 51st state?

Not really. If Canada wanted to join, and Congress passed a law.

Texas was an independent nation before it was annexed by the the US. Yet Congress cut down its size a bit before admitting it. The other parts later became parts of other states.

I suspect Canada would have to be split into several states due to its size.

The funny thing is it would help liberals not conservatives, with all those new liberal states!

I suspect Quebec would resist and become independent.

Of course, so would Canadians, so it would never happen! And Britain and the rest of Europe would protest.

Trump is a dweeb.