Every day, roughly one-fifth of the world’s oil supply squeezes through a narrow waterway on Iran’s southern border. It is one of the energy industry’s most important trading routes — and one of its most vulnerable.

Iran's parliament on Sunday approved a move to close the Strait of Hormuz, the entrance to the Persian Gulf where nearly a quarter of the oil shipped around the world passes…

One-fifth of the world’s oil and gas passes through the Iranian-controlled Strait of Hormuz