Ok for those of you who haven't heard this concept, manifest destiny is the belief that America had a mission to expand and spread democracy to the world. I'm actually surprised we don't still use the term. It was used a lot to describe the need for Americans to discover what is all America now. But you're probably wondering what this has to do with paranormals aren't you. Well the native Americans couldn't have been the only ones to get caught up in the manifest destiny phenomena.
wereanimals - They normally had lots of space to roam in. Were left in peace and didn't have to worry about to many people. Now there are people everywhere and very little space unless they want to live in a national park.
Vampires - well they got some bonus's. The area that was uncharted was pretty much uninhabited for them. They couldn't hide amongst the native Americans because there were to few in a group and people would notice. Feeding off of animals is risky too. Pick a creature to big and you could get injured. Pick something to small and you have to eat more frequently.
Ghosts - well we Americans certainly know how to expand the ghost population. The more people kill unjustly the more ghosts there can be. Think trail of tears on this one people. You do the numbers.
Demons - oh demons would be all up for manifest destiny. They are all up for expansion. Demons need people do to thing that are bad. Lets face it. No matter how much I love cities demons would have a much easier time harvesting sins in a city then in the country. You just do the people math. There are fewer people in the country. Fewer people equals less sins it's that easy. I'm not saying there isn't sin in the country just fewer people to commit it.
Magic users - Again you have a split with the magic users. Some are going to be happy to move on and expands. While others just want there peace and quiet. The hard thing with magic users is that there are so many different types of them and each one requires something different. Some need the space to grow things. Others need a large amount of people to be left alone with. It's a difficult call.
So as you see even paranormals can be effected by politically motivated decisions.