Take the following as truth: Though novel for its open endorsement of indiscriminate killing, Bin Ladin's 1998 declaration was only the latest in the long series of his public and private calls since 1992 that singled out the United States for attack.
Then the following statement: "Bin Ladin had a history of campaigning for an attack on the United States." is true, false, or inconclusive?
Answer: True