To make your research easier, you may want to check out an online state encyclopedia. Not every state has one, but those that do include articles on people, localities, events, and history that can assist you in researching and understanding your ancestors. These encyclopedias are different from traditional print or online encyclopedias in that they solely focus on a particular state. I have used The Handbook of Texas Online numerous times to research my family and the cities they lived in. This has provided me with information about towns that do not exist anymore and may be more difficult to find information about. Here are some available encyclopedias:
The Encyclopedia of Arkansas History and Culture
Laptop Encyclopedia of Connecticut History
Encyclopedia of the History of Missouri
The Encyclopedia of New York State
Encyclopedia of Oklahoma History and Culture
Tennessee Encyclopedia of History and Culture
History Link, the free online encyclopedia of Washington State