What is the main reason Suez canal was needed?

To reduce travel time and distance for trade routes between Europe and Asia.

Before the Suez Canal was built, ships traveling from Europe to Asia had to sail around the southern tip of Africa, a journey that could take several months. The Suez Canal provided a much shorter route, allowing ships to travel between the Mediterranean Sea and the Red Sea in just a few days. This significantly reduced the time and cost of trade between Europe and Asia, leading to a boom in global commerce.

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