Just as lawyers always wrap up their cases with closing arguments, you must tell the reader what you have argued. You might wish to elaborate quite a bit more her, depending on available space. You can take some license here and make a prediction based on your argument. You might relate your argument to some general question of interest. You can also give your personal views here.
Plagiarism is the use of another's words without crediting that person.
It is considered dishonest behavior, and it is a serious academic offence. I have caught numerous plagiarists during my teaching career. Professors handle plagiarism different, but in my case a student caught plagiarizing receives a failing grade on the assignment, a failing grade in the course, and is reported to the University. Given the seriousness of plagiarism, students are often worried that they do not know what to cite and what not to cite. A good example would be the statement that the U.S. has presidential elections every four years, or that Fidel Castro has been in power since 1959.