For a great persuasive speech, argue that cultural artifacts should be returned to their countries of origin. For a case study, you could focus on the so-called Elgin marbles. These marbles, which belong largely to the Parthenon in Greece, were removed from Greece during Turkish occupation in the early 1800s. Since Greek independence in the 1830s, scholars, politicians, citizens and archaeologists have argued about whether or not the marbles, which are housed in the British Museum, should be returned to Greece.
You could write a persuasive speech suggesting that everyone should be an organ donor. You could research statistics, such as the suggestion that a single person, through organ donation, could save up to eight lives and enhance many more. Combat the common myths about organ donation, including the circumstances under which your organs can be taken and that some religions prohibit organ donation (in fact, most major religions support organ donation).
If you're looking for a good persuasive speech topic, consider arguing that the American Dream still exists, if in a different sense. Look at examples of immigrants or individuals from disadvantaged circumstances who have overcome obstacles to become successful and happy. Look at people like Alli Bakash Majeed, a judge in Brevard County, Florida. Majeed was born into a large family in South Africa in poor circumstances. Eventually he made it to the United States, attended college and law school and became a judge. Examples like that of Majeed can be found throughout the country.
Another option for a persuasive speech is to extol the benefits of recycling. Discuss how recycling protects and expands domestic manufacturing, reduces the need for landfills and prevents pollution that results from manufacturing products with virgin materials. Use statistics from reliable sources like the Environmental Protection Agency. Provide solutions to recycling dilemmas and give examples of how people can make a difference on a small scale.