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How did competition between European powers encourage colonial expansion?

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Map of North America in 1763 using color coding to show colonial territories: the 13 American colonies in red along the Atlantic coast, other British territory in orange across much of present-day Canada, Spanish territory in purple covering most of the southern and western regions, Russian territory in green in the northwest, and large areas of unclaimed land in white. Major bodies of water such as the Atlantic Ocean, Pacific Ocean, Gulf of Mexico, and Hudson Bay are labeled. — Western colonialism North America during the colonial period.

Competition between European powers was a primary driver of colonial expansion, as overseas territories became essential levers of national power, military strength, and wealth. This rivalry functioned in several key ways:1

Strategic Preclusion: As the number of nations seeking colonies increased—particularly with the emergence of new powers like Germany, Italy, and Belgium—the available "unoccupied" space shrank. This created a premium on speed, forcing nations to engage in the preclusive occupation of territory to prevent rivals from gaining an advantage.2
Military and Economic Security: Colonies served as vital sources of military supplies, manpower, and strategic bases for navies and merchant marines. Nations sought to control territory to defend existing empires against competitors.12
Intensification of Authority: Domestic rivalries in Europe often accelerated the pace of colonization in regions like western Africa. The appearance of a rival power, such as Germany, in a contested area frequently prompted Britain and France to formalize and expand their own political and military control to protect their interests.3
Redivision of Power: As colonial space became limited, lesser powers felt an increased urgency to remedy disparities in empire size by seeking a redivision of the colonial world, which intensified diplomatic maneuvering and conflict.2