Before the Iran war, how empires fought for the Strait of Hormuz

For UPSC Prelims, mapping the Strait of Hormuz is a high-probability topic due to its outsized role in global affairs. It is a strategic maritime chokepoint (a narrow route providing passage to another body of water that is easily blocked or controlled) connecting the Persian Gulf in the west to the Gulf of Oman and the Arabian Sea in the southeast. Bounded by Iran to the north and Oman and the United Arab Emirates to the south, its geography dictates global energy security. At its narrowest, the strait is only 21 miles wide, yet it facilitates the transit of roughly 20% of the world's petroleum. Understanding this physical vulnerability explains why modern geopolitical actors, such as the US and Iran, continually use naval blockades and military posturing in this specific corridor to exert leverage over the global economy.

The evolution of colonial control in the Gulf perfectly illustrates changing imperial strategies and the concept of mercantilism (an economic policy designed to maximize exports and minimize imports through imperialism). Initially, the Portuguese relied on heavy militarisation and expensive stone fortresses to tax spice merchants, which ultimately proved financially unsustainable. In stark contrast, the British East India Company employed a cost-effective mix of naval supremacy and diplomatic alliances, creating the Trucial system. Through treaties like the Exclusive Agreement of 1892, local Arab sheikhdoms were transformed into the Trucial States, surrendering their foreign policy and defence to Britain while retaining domestic administrative autonomy. This brilliant strategic outsourcing secured the maritime flanks connecting Europe to British India, facilitating the extraction of South Asian wealth without the massive administrative burdens of direct territorial rule.

The transition of the Gulf's significance from the spice trade to fossil fuels marks a watershed moment in modern geopolitics. The 1908 oil discovery in Persia led to the formation of the Anglo-Persian Oil Company (the forerunner to the modern oil supermajor BP). Recognizing that oil was the fuel of the future, the British government acquired a 51% controlling stake in the company by 1914 to power its modernizing navy. This explicitly linked Western military superiority to Middle Eastern stability, establishing a doctrine of energy security that heavily influences foreign policy today. For UPSC Mains (GS Paper 2), understanding this historical shift is crucial when analyzing contemporary conflicts; modern powers continue to deploy fleets to secure these exact same chokepoints, maintaining a legacy of maritime hegemony designed to prevent catastrophic disruptions in global supply chains.