In what year did 'Boardwalk Empire' premiere?

In what year did 'RuPaul's Drag Race' premiere? In what year did 'The Walking Dead' premiere? Who created 'The Walking Dead'? On which network did 'Boardwalk Empire' originally air? Where is 'Boardwalk Empire' set? Who created 'Boardwalk Empire'? On which network did 'Downton Abbey' originally air? In what year did 'Downton Abbey' premiere?