This document summarizes the major social, political, and intellectual developments that occurred in 18th century Europe. It discusses the rise of absolute monarchy in many countries, but its failure to take hold in some like the UK. It also outlines the growing population and division of society into three estates. The Enlightenment thinkers like Montesquieu, Voltaire, and Rousseau pushed back against absolutism and advocated for reason, tolerance, and participatory democracy. The document also provides some specifics on developments in Spain during this time period under various rulers.