Germany had a very powerful Navy during World War One, because their U-Boats (Submarines) were the most efficient and they were the first to make them. And so they had lots of U-Boats which gave them an advantage. Arguably Germany had the strongest Navy in both World Wars. (1 and 2)
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The British Royal Navy.
The largest ARMY was the Union, in America. The largest MILITARY force was Britain, mainly because of it's navy.
Russia .
Russia
Josephus Daniels was Secretary of the Navy during World War I.