During the intervening years, Alabama was the site of some of the most defining events of the civil rights era. These events transformed the state and profoundly changed America. Black protest started long before the civil rights movement emerged and continued long after it stopped receiving front-page headlines.
Also, you can play versus(and survival, if you get the GOTY edition) offline by selecting join friends, the pressing X to start your own lobby, it tricks the game into letting you play the modes. Why there wasn't just an offline option on the main menu is beyond me.
So make sure that you play your best and get them fast! Supply Drops and play time. Another thing that seems to be true in my case is that the more time you spend in the game, the higher the chances of you earning a supply drop. So the more you stay in multiplayer and level up, the more supply drops you will get.