Imagine a narrow water route — just 33 kilometres wide at its tightest point — and picture one-fifth of the entire world's oil passing through it every single day. Tankers carrying fuel for your car, gas for your kitchen, energy for factories — all moving through this one bottleneck. Now imagine that route is nearly shut down. That is exactly what is happening today at the Strait of Hormuz, and the United States is rushing thousands of its most powerful soldiers and weapons to fix it.