The primary reason france and japan were interested in controlling parts of indochina in the 20th century was to ?

France and Japan were interested in controlling parts of Indochina in the 20th century primarily for economic reasons, strategic advantages, and political influence. For France, establishing a colonial presence in Indochina (comprising modern-day Vietnam, Laos, and Cambodia) was part of a broader strategy of imperial expansion, driven by the desire to exploit the region's natural resources, such as rubber, coal, and metals, and to open new markets for French goods. The possession of colonies was also seen as a sign of national prestige and power.

Japan's interest in Indochina during the 20th century, particularly during World War II, was also based on economic and strategic considerations. The region's resources were crucial for Japan’s war effort, providing materials that were scarce in Japan, including rice and rubber. Additionally, controlling Indochina allowed Japan to secure its southwestern flank and to cut off supply routes to China, where Japan was engaged in a prolonged conflict.