How were European colonies involved in the war during World War 1

New Imperialism involved each European power trying to acquire colonies and expand its empire between the 1870s to the outbreak of World War I in 1914. The Scramble for Africa was a major highlight of New Imperialism. Colonies were an important source of manpower

Explanation:

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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