How did most eras end?

Most historical eras have ended due to a combination of significant social, political, and economic changes, often marked by major events such as wars, revolutions, or shifts in power. These transitions frequently involve the decline of established institutions, the rise of new ideologies, or technological advancements that alter societal structures. Additionally, environmental factors or economic crises can catalyze these endings, leading to a transformation or redefinition of the era. Ultimately, the end of an era signifies a profound shift that paves the way for new developments and historical periods.