An undergrad degree in history doesn't open a lot of doors, so you might plan on getting a graduate degree. Grads with a BA in history go on to law school, museum/archive work, libraries, historical organization/societies, etc. For the most part, you would narrow your focus in grad school and become somewhat of an expert in a particular area of history. To run with the big dogs, you'll need a PhD. Before you decide on any degree, map out your career goals.