This 100-year-old book still explains our endless wars. As the extraordinary death and suffering of World War I unfolded, Vladimir Ilyich Lenin tried to explain why so many nations agreed to sacrifice so many people in such a brutal way. Expanding on the works of other political and economic theorists, including Karl Marx, Lenin provided an answer: Capitalism. In Imperialism: The Highest Stage of Capitalism, Lenin extends his scorn to the international socialist movement.

This landmark book, first published in 1978, remains one of the most influential books in the Social Sciences, particularly Ethnic Studies and Postcolonialism. Said is best known for describing and critiquing "Orientalism", which he perceived as a constellation of false assumptions underlying Western attitudes toward the East. In Orientalism Said claimed a "subtle and persistent Eurocentric prejudice against Arabo-Islamic peoples and their culture."

Here, anthropologist David Graeber presents a stunning reversal of conventional wisdom: He shows that before there was money, there was debt. For more than 5,000 years, since the beginnings of the first agrarian empires, humans have used elaborate credit systems to buy and sell goods - that is, long before the invention of coins or cash. It is in this era, Graeber argues, that we also first encounter a society divided into debtors and creditors.

State and Revolution (1917) describes the role of the state in society, the necessity of proletarian revolution, and the theoretic inadequacies of social democracy in achieving revolution. It describes the inherent nature of the state as a tool for class oppression, a creation born of one social class' desire to control all other social classes. Whether a dictatorship or a democracy, the state remains in the control of the ruling class.

This remarkable account has had an enduring influence on social and economic studies and has remained in print since its first English publication in 1885. It was written, in German, by a youthful Friedrich Engels, the son of a German industrialist, who was already concerned - even angered - by the conditions he saw inflicted on the working classes as the Industrial Revolution gathered momentum. His first visit to England (1842-44) and what he saw there with his own eyes fuelled his concerns and prompted him to make this formal study.