Research!!
There are many places to find information for your project!!
Start at the Library; defining your topic and the question is one of the most important things you can do!
Start with the dictionary if  you need to clarify or understand any words better.An adult, or the Librarian can help.
An encyclopedia will give you a good overview of your topic and the key words; for example Democracy.....
democracyThe word democracy literally means “rule by the people.” It is derived from a Greek word coined from the words demos (“people”) and kratos (“rule”) in the middle of the 5th century BC as a name for ...This came from    http://kids.britannica.com/

By the way, click on that photo!! You might be surprised to find how important it is for some people to have the right to vote....Why do you think that might be? And why these people in this photo??

This is an online  encyclopedia...think beyond wikipedia!!
Remember, every-time you use a source, whether its a website or a book, document the address or details carefully for your referencing. This is an important part of your learning!!