The document provides background information on several topics:
1. It describes the Anglo-Saxons as Germanic tribes that invaded Britain and established the English nation until the Norman conquest in 1066.
2. It provides brief biographies of several important historical figures, including Matthew Perry, Queen Liliuokalani of Hawaii, Alfred Mahan, and Theodore Roosevelt.
3. It discusses several topics related to American imperialism such as Pan-Americanism, the Platt Amendment, and the Boxer Rebellion.