The spread of imperalisation was driven by:

In the Age of New Imperialism that began in the 1870s, European states established vast empires mainly in Africa, but also in Asia and the Middle East. ... Through the use of direct military force, economic spheres of influence, and annexation, European countries dominated the continents of Africa and Asia.

Explanation:

Based on their belief in the conservative economic theory of “Glory, God, and Gold,” trade-motivated imperialists of this period saw colonialism as purely a source of wealth and vehicle for religious missionary efforts. The early British Empire established one of its most profitable colonies in North America.

in londan the most because it was one of the growing countries