title: Don Bluth
context: Teaming up with producer Steven Spielberg, Bluth's next project was An American Tail (1986), which at the time of its release became the highest grossing non-Disney animated film of all time, grossing $45 million in the United States and over $84 million worldwide.[15] The second Spielberg-Bluth collaboration The Land Before Time (1988) did even better in theaters and both found a successful life on home video.[15][16]  The main character in An American Tail (Fievel Mouskewitz) became the mascot for Amblimation while The Land Before Time was followed by thirteen direct-to-video sequels.
question: What was Don Bluth's second film to direct?
answers: The Land Before Time