In the appendicies to The Return of the King, there is an entry "The Watchful Peace Begins." During this time, Gondor placed fortresses on the borders of Mordor to keep in the enemies. Nothing happened for hundreds of years.
Bear this in mind as you bear with me. I have been insanely busy these last two weeks, which is why I haven't really been posting anything. Why have I been busier? I have no clue.