HEY YOU... LOOK HERE AND PLEASE ANSWER MY AP WORLD QUESTION!!?

They were really good with boats. I believe it was the junk (a type of boat) that gave them such an advantage over everyone else, and the fact that like half of their boarders are on the ocean.... I am pretty sure that it was when everyone else decided to get their heads in the metaphorical naval game that they started their decline. I could be wrong, but I don't think I am.