How many new square miles did the rabbits take over in 1860?

Well, honey, in 1860, rabbits didn't have real estate agents to keep track of their land grabs. So, I can't give you an exact number of square miles those fluffy hooligans took over. But I can tell you that rabbits are pretty good at multiplying like, well, rabbits, so I'm sure they found a cozy spot to call their own.