History is both the study and the research of major social, political, cultural, and economics events of the past. Applying the results of historical study is important for the preservation and future growth of nations and institutions. Knowledge of the past can enable individuals to develop pride and appreciation for the past accomplishments of others. In addition, a through understanding of past problems and the strategies used to resolve them can help humans to plan their present and future lives more effectively. Historical study is normally divided into ancient, medieval, or modern.