Well, since the US, has never been allied with Germany in any war other then Afghanistan, trading with them during the war would have been an act of treason and would have nothing to do with Britain anyway.
Other then that, I imagine you could consider Most Favored Nation clauses, impeding any beneficial trade favors made towards new trade partners.
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They blockaded around UK. With their U-Boats, the Germans torpedoed at any ship that went in and out of English ports, including innocent passenger ships.
The Nazi Germans sent out UBoats (submarines) and other ships to sink merchant ships and even cruise ships to prevent the cargo from reaching the United Kingdom.
They used U boats to sink merchant ships carrying supplies to Britain from America
August 4 1914, after Germany did not withdraw from Belgium, Great Britain declared war on Germany.
Why did Great Britain declare war on Germany? Great Britain declared war on Germany because German tanks forced their way across the Polish border on august 4th 1914
Great Britain declared war on Germany in September 1939 after Germany invaded Poland.
Answer this question… Great Britain, a NATO country, had a democratic government. East Germany, a member of the Warsaw Pact, had a communist government.
Germany