I'm sorry, Ashley, but as a home school dad with a lot of experience in teaching children, I can't answer that question for you.
I read our Battle of Saratoga page carefully, asking myself if it would be fair to ask my own children to present three reasons that the Battle of Saratoga was a turning point in the war. It is fair, and I would ask my children to come up with the three reasons on their own.
If I answered your question, I'd be doing your homework for you. That would be cheating you. You can pull three reasons from that article. You can find at least two just from the last section alone, which is the only hint I'm going to give you.