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.
In this video I'm going to show you how to play Left 4 Dead survival mode in single player. Please watch whole video. Console commands (you can open console by pressing ~ key): map (type map name you want to play) example: map l4d_smalltown03_ranchhouse. mp_gamemode survival. After that call a vote to restart round.