What was the importance of the railroad ?

Railroads are the most efficient transportation mode for moving goods on the earth's surface. Railroads are of particular importance for the movement of commodities that heavy and moved in bulk over long distances where the transportation spend represents a large portion of the total delivered cost

Explanation:

the world may never know

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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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