The "american system" proposed by henry clay was a plan to:
a. protect the planters in the south
b. develop the public schools in the north and south
c. resume trade with england after the war of 1812
d. gain prosperity for the nation through a protective tariff

hello!

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".

hope this