New America City — The Science Frontier

Following the revelation that the petrification technology has extraterrestrial origins, Senku determines that understanding the Why-Man — the entity broadcasting petrification signals from the moon — requires reaching America and rebuilding technologies capable of space travel. The crew of the Perseus navigates to North America, where they encounter a surviving civilization descended from a plane's passengers who escaped the original petrification. This community possesses industrial infrastructure from the old world, enabling dramatic acceleration of Senku's development timeline, but also introduces new political tensions and a new antagonist with their own vision for using advanced technology.

The journey to America marks the most ambitious phase of Dr. Stone's civilizational rebuilding project. Senku's target is not just geographic — it's technological. America's preserved industrial infrastructure, even in ruins, contains materials and equipment whose production from scratch would require generations. The combination of Senku's scientific knowledge applied to existing remnants creates an exponential development curve. The discovery of a community descended from passengers of a grounded plane introduces Stanley Snyder, a military operative of extraordinary tactical skill, and Dr. Xeno Houston Wingfield, a brilliant scientist who was Senku's mentor in the old world. Xeno has independently rebuilt a civilization of his own, paralleling Senku's Kingdom of Science with a different philosophical emphasis: efficiency over collaboration, hierarchy over egalitarianism. Xeno is not a villain in the Tsukasa mold — he is Senku's intellectual equal with different values and different methods. The conflict between Senku and Xeno's civilizations mirrors the series' central argument from a new angle. Senku's Kingdom of Science is fundamentally democratic — it works because everyone contributes their distinctive skills and those contributions are valued. Xeno's civilization is meritocratic in the harshest sense — value is determined by utility, and inefficiency is eliminated. Both systems produce technological results, but only one can produce the social cohesion necessary for a civilization that might survive indefinitely. Stanley's combat capability creates a genuine tactical problem for the Kingdom of Science's pacifist tendencies. He is willing to use extreme violence to protect Xeno's civilization, and his precision eliminates Senku's ability to simply out-innovate military threat. The arc's resolution requires combining Senku's technological ingenuity with the Kingdom of Science's social intelligence — Gen's manipulation, Chrome's improvisation, and Kohaku's combat skill deployed simultaneously against Stanley's individual military excellence. The arc ends with Xeno captured and the two civilizations in uneasy coalition, united by the recognition that reaching the moon — Senku's next declared objective — requires the combined resources of both groups. The Why-Man's continued transmissions from the moon establish the series' final endpoint: humanity must achieve spaceflight within a single generation to confront whatever force originally petrified the species.