Is there a lack of direct logical connection between the premise and the hypothesis? Premise: Not until 1998 did al Qaeda undertake a major terrorist operation of its own, in large part because Bin Ladin lost his base in Sudan. Hypothesis: After this operation, Bin Ladin was motivated by the effectiveness of the attack.
Not until 1998 did al Qaeda undertake a major terrorist operation of its own, in large part because Bin Ladin lost his base in Sudan.###After this operation, Bin Ladin was motivated by the effectiveness of the attack.