which one of the four cause of imperialism had the biggest cause Global Competition, Desire for Military Strength, Thirst for New Markets, Belief in Cultural Superiority.

Thirst for New Markets.

Explanation:

All these factors have their basis in the spread of Imperialism. Still, the effort for the imperialists to gain new markets is the biggest factor of all. The period of Imperialism is connected with the beginning of the Industrial Revolution. Large industrial corporations rushed to place their goods in new markets to sell them. In this context, the effort to reach new markets meant the launch of new industrial plants in these countries. In this way, they came up with cheap labor.