Facts from reliable, cited sources can make any paper stronger. It can be difficult to decide whether a factual source is reliable or not. The sources of facts below are generally good, but you will need to take a hard look at who is providing the information and what the audience for that information was. News sources, for example, can vary a lot in how reliable they are as sources of facts. If you aren't sure about a particular source, try googling it to find out who the people are who provided the information. Are they neutral or are they pushing a particular agenda? Are they trying to be objective, or are they aligned with a special interest? Though it is impossible for a source to be completely objective, the more neutral and authoritative it is, the more persuasive its facts will be in your argument.
News Reports
Statistics about People, Health, Labor and Ethnic Groups in the U.S.
Farms, Food & Environment
Animal Welfare
Government Facts