Which was the major cause of foreign intersest in Persia?

The major cause of foreign interest in Persia (modern-day Iran) was its vast Natural Resources, particularly oil, discovered in the early 20th century. This oil wealth attracted the attention of European powers and later the United States, as they sought to secure energy supplies and expand their geopolitical influence in the region. Additionally, Persia's strategic location along trade routes and its historical significance further heightened foreign interest.