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Jan 4, 2015 at 4:06 history edited PolyGeo CC BY-SA 3.0
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Jan 3, 2015 at 15:26 comment added bgwiehle To add to point 1, civilian traffic across the Atlantic was severely curtailed by 1917, due to risk of attack (Lusitania, 1915) and appropriation of ships for military use.
Jan 3, 2015 at 9:13 history edited PolyGeo CC BY-SA 3.0
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Jan 3, 2015 at 7:57 history edited PolyGeo CC BY-SA 3.0
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Jan 3, 2015 at 7:49 history answered PolyGeo CC BY-SA 3.0