Investors in the stock market
The chief result of U.S participation in World War 1 is, that the U.S forces ended the stalemate and let go an allied victory. The U.S was the force they needed
Brutus really loves Caesar but is so idealistic that he won't allow him to betray the Roman people by ignoring them. As the quote says, Brutus would not allow Caesar to rise to power and then ignore the people who helped him gain power the people of Rome.