Now that actually did happen. Groups of each moved into Kansas territory so they can make it either a slave or free state. It had so much bloodshed they had a little war called Bleeding Kansas. The two groups were both called Border Ruffians and they fought each other to gain the power.
The Louisiana Purchase of 1803 brought into the United States about 828,000 square miles of territory from France, thereby doubling the size of the young republic.