Start your research here. This Library database has reliable resources in many media on exactly the sorts of topics you are working on.
EBSCOhost is a collection of databases that all search similarly. Some cover all topics and some cover a single subject area. These links will take you to the ones I recommend for your topics:
1. See if there are any pre-evaluated web links for your topic in Opposing Viewpoints.
2. Limit your web search to US government or US college and university websites using Google Advanced Search (limit to domain .gov or .edu).
3. Evaluate websites that you find, using the CRAAPP Test.