I think zombies have always been an easy metaphor for hard times. Because they're this big, faceless, brainless group of evil things that will work tirelessly to destroy you and think of nothing else.
Movie characters rarely get to think out loud or talk very much about their emotions. Instead they have to, very briefly, show their feelings through their action or through dialog.
So I grew up in a very book-friendly environment and my education as a writer was reading. I think that's the best education. Reading, and taking from the people I admired.
I think any period in history can be adapted into interesting fiction, as long as you approach the actual history with respect.