Do you mean The American Revolution? If thats the case, the arguments in favor it Britain is that they have the the strongest navy, so without the help of the French (including Lafayfette) they couldn’t stand a chance, and the king(King George III) tried to pay the debt, and prevented the colonists (Americans) from going to the other side, so they don’t have to get into a fight with the natives. As for against, King George took too much control, and even made a declaratory law that he could control what happens in the colonies, and that the colonists would have very little power. He was also taxing them, but they were poor, so they rebelled against him. Sorry if I wrote a book. Also, I hope it helps you!
The author supports his argument with a claim that a 16 year old's brain needs more time to develop. He also includes an opposing claim that a person's brain at 16 years old is mature enough to vote.