RWBY: U.S in Remnant

The U.S. a nation known for being a world power across the world but soon enough the U.S. falls into disarray as the nation fights a civil war but soon enough a single victor comes on top. Now the worlds nations plan on taking down the U.S. but before they get their plan in motion the U.S. is soon caught by surprise by an unknown portal which unknown animals come out of but there is something off about those creatures as they become hostile the second they cross over.