One of the main things the US government did after entering the war in 1917 was to

After the United States entered World War I in 1917, it needed to build up its forces to send troops to Europe. The government used the Selective Service Act to draft and recruit more soldiers, so “recruit more soldiers” is correct. The United States had already broken diplomatic ties with Germany before declaring war; Germany, not the United States, began unrestricted submarine warfare.

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