Europeans governed their colonies in Asia and Africa by *

1914

Explanation:

Through the use of direct military force, economic spheres of influence, and annexation, European countries dominated the continents of Africa and Asia. By 1914, Great Britain controlled the largest number of colonies, and the phrase, “the sun never sets on the British Empire,” described the vastness of its holdings.

answer; ///i believe that the correct answer is refrigerants,(like r12) and aerosol

c, they united with once