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At the onset of the World War I, Britain declared war on Germany because of their move to force Belgium to give up its neutrality and allow German troops across its borders, even after Britain demanded the halt of their ... More »

www.reference.com History Modern History World War 1

France and Britain declared war on Germany on Sept 3, 1939 in response to Germany's invasion of Poland on Sept 1, 1939. France and Germany were allies, and they combined forces with many other allied countries to defeat ... More »

www.reference.com History Modern History World War 2

According to the U.S. Constitution, only Congress has the power to declare war. However, often a U.S. president has initiated armed conflict and requested congressional approval afterwards. Also, in lieu of a formal decl... More »

www.reference.com Government & Politics
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When Britain entered World War I, it was primarily in reaction to Germany invading Belgium. Britain promised to defend Belgium in perpetuity under the Treaty of London, which it entered into in 1839. A secondary reason t... More »

www.reference.com History Modern History World War 1

Britain entered World War I in 1914 to honor a treaty that promised to defend Belgium and to fulfill an alliance with France and Russia. The Germans attacked Liege, Belgium, in the first battle of World War I, and then m... More »

www.reference.com History Modern History World War 1

Germany initially became part of the first World War due to the treaty it had with Austria-Hungary, which had declared war on Serbia due to the assassination of Archduke Franz Ferdinand. France and Russia were both also ... More »

www.reference.com History Modern History World War 1

In World War I, Germany declared war on France as part of a long-held strategy called the Schlieffen Plan. The Schlieffen Plan required German troops to organize on the frontier of Belgium, a neutral country, with the id... More »

www.reference.com History Modern History World War 1