Why did european nations increasingly form alliances in the early 1900s? a. to promote travel b. to provide a balance of power c. to ensure open borders d. to make it easy to found colonies

The increasingly forming of alliance of the European countries was based on the balance of power theory. Thus, the answer is letter B. The premise of the theory is the heightened security when the military strength is distributed in a way that no nation has the capability of dominance. 

The European nations increasingly form alliances in the early 1900s  : B. to provide balance of power

if 1 country is way stronger than the other, it will be easier for that country to attack its neighbor and conquer its territory. With alliance, they prevent such things from happening

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