The video "Origin of Everything: Why are 18 Year Olds Considered Adults?" explores the historical and cultural reasons behind the age of 18 being recognized as the official start of adulthood. It challenges the idea that this age is based solely on physiological maturity, indicating instead a complex interplay of historical events and legal changes. Key points include a look at labor laws and child protection that arose during the Industrial Revolution, the significant role of Franklin D. Roosevelt in lowering the draft age during World War II, and the eventual formation of the 26th Amendment enshrining voting rights for 18-year-olds. The video also addresses shifts in societal perceptions of childhood and the influence of civil rights discussions. This content is relevant in understanding the legal rights and responsibilities gained at 18, shedding light on citizenship and adolescence.