I would have loved a North American Union with free trade, freedom of movement, and shared currency between Canada, the US, and Mexico, maybe even Cuba as well if it didn't infringe on their communism. But that was a dream from a more naive time when we could've been better neighbors.
These days it's enough to demand that our borders and healthcare costs don't increase. No new wars, no new territories, and we need to let Puerto Rico choose between statehood and independence.