The Strait of Hormuz has become the latest test of American naval power, and the balance may be shifting. The U.S. is now finding ways to keep a significant share of commercial shipping moving through the vital waterway, even as pressure on Iran’s energy exports intensifies. A major geopolitical gathering unfolded in Central Asia this week at the SCO meeting in Bishkek. While the spotlight was on the summit, another diplomatic move was unfolding right outside it. The next frontier of the U.S.-China rivalry may not be on land, at sea, or even in the skies above us, but hundreds of kilometres above Earth. Washington and Beijing are rapidly developing new technologies that could change how wars are fought and won.