I believe that peace is a good thing, and less wars in this continent would benefit many. This does not mean that we should combine all of these independent countries and form a union though. There are many historical examples of why this should not happen. Take for example the American Revolution. The Americans resisted because they disliked being ruled by a King living overseas. This caused a war which led to our Independence, and now our country is a world superpower with a huge army and many inventions that have helped everyone. If people in mexico were being ruled by a guy up in Canada, tensions would rise and a civil war between these countries might occur. Thank you.
I believe we have reached a point in civilization that we don't need to worry about silly wars over land, at least in the developed world. Now a union doesn't mean we are 1 country, it means that there will be some decisions made as a collective, that will make trade, economics, and world politics a little easier, on a mass scale of course. But leaders dictating other country's is a bit of an exaggeration, look at the European Union, every country still kept their own government systems. If anything bringing in a union would do wonders for the economy, which the US would benefit from greatly. The only thing people might have to get used to is a new currency. Which has been dubbed the Amero by the way.