How was World War I different from earlier wars? A It started because of alliances and treaties.

B Belgium was involved in a war.

C There were so few people involved in the war effort.

D There was such a huge number of people involved in the war effort.

A It started because of alliances and treaties.

Explanation:

The First World War differ from previous wars because its reliance on advanced industrial technology and the elaborate economic and political organization of belligerent nations. The first widespread use of machine guns, air power, submarine operations, poison gas and armored vehicles.

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