The term 'Stage of History' can be summarized as an ERA, which is a three-letter word. An ERA is a period of time in history that is defined by certain characteristics, such as political, social, and cultural developments. It is usually marked by significant events or changes in the way people live. For example, the Renaissance ERA was characterized by a renewed interest in art, literature, and science, while the Industrial Revolution ERA saw the development of new technologies and the growth of cities.