1. Them being for the sake of their economy, religion and glory.
2.They wanted to improve their economy for instance by acquiring more spices, gold, and better and faster trading routes.
Having a uniform legal system is important because if we didn't have one, things that were illegal in one part of the country would be legal in another part. Criminals would all travel to the places were crime was easier to commit.
Hope this helps! Please let me know if I'm wrong :)
Wilson believed that the United States is determined to protect democratic ideals.