As far as I'm aware, no one in my family has traced our heritage to further back than the oldest can remember, which would be my great, great grandparents. So I can say that about a hundred years ago my relations were doing nothing of terrible importance, one guy was a WWI grunt (Mainly because that was better than unemployment), another was a cook for the marines, and one was, in fact, a marine. The rest were working pretty mainstream jobs. Two people did missionary work and one was with the Peace Corps in the past 50 years.
Although I can't say for sure, I kind of get the feeling that before the 20th century my family members were what was at the time called 'drunks' and 'sluggards'. Somebody told me that four hundred years ago one of my relatives was involved in governor-level politics in colonial America, but I'm not sure I believe that. It seems that people from my family that aren't just simple, half-competent workers tend to either get roped into low-position government jobs, or join the age-appropriate counterculture. Either way, though, we tend to be a pretty mellow bunch. The only current exceptions are the aging ex-marine and a cousin of mine in the Midwest, those two are wound pretty tight.
If you want to hear about how and why my family moved and spread, I'd have to say that we go where we think the money is good. There are even two or three instances of us guessing right!