The concrete ship sounds like it belongs to the same class of object as the chocolate teapot. Persons who had been displace by having their homes destroyed in the Second World War at first stayed with other family members or friends or requisitioned hotels. Property could be requisitioned under the Emergency Powers (Defence) Act 1940. Useless. America entered World War One on April 6th, 1917. Entries are listed below in alphanumeric order (1-to-Z). i.e. Flag images indicative of country of origin and not necessarily the primary operator. World War I began in 1914, after the assassination of Archduke Franz Ferdinand, and lasted until 1918. Up to that date, America had tried to keep out of World War One – though she had traded with nations involved in the war – but unrestricted submarine warfare, introduced by the Germans on January 9th, 1917, was the primary issue that caused Woodrow Wilson to ask Congress to declare war on Germany on April 2nd. After the United States entered World War I in April 1917, Woodrow Wilson quickly established the Emergency Fleet Corporation to oversee the construction of cargo ships. There are a total of [ 117 ] WW1 Warships and Submarines (1914-1918) entries in the Military Factory.