)how many men were in service when war was declared?
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10 million men

To that end, Congress passed the Selective Service Act, which Wilson signed into law on May 18, 1917. The act required all men in the U.S. between the ages of 21 and 30 to register for military service. Within a few months, some 10 million men across the country had registered in response to the military draft.

Explanation:

i believe it was spain

number   5 i know this because savannah was the first capital and i took the test and all you have to do is look up a map of georgia savannah.