Explore: Declared War

between 1700 and 1870 war was declared in only 10 cases, e.g. the 1812 French declaration of war on Russia or the Declarations of war by Great Britain and

Austria-Hungary blamed Serbia, and declared war on 28 July. After Russia mobilised in Serbia's defence, Germany declared war on Russia and France, who had

Harbor in December 1941, after which it declared war and officially joined the Allies. China had already been at war with Japan since 1937, and formally joined

1941, Germany launched Operation Barbarossa and on June 28 Albania also declared war on the USSR. In October 1941, small Albanian Communist groups established

Adolf Hitler, invaded Poland, after which the United Kingdom and France declared war on Germany. Poland was divided between Germany and the Soviet Union under

three days after the United States declaration of war against Imperial Japan, Nazi Germany declared war against the United States, in response to what was

the French invasion of Russia. The first stage of the war broke out when Britain declared war on France on 18 May 1803, alongside the Third Coalition

States, organized by time period. Although the United States has formally declared war only 5 times and these declarations cover a total of 11 separate instances

December 1941, Japan launched a surprise attack on Pearl Harbor and declared war on the United States. The US increased its aid to China under the Lend-Lease

The two declared war on Britain after signing the Treaty of Versailles (1756), with a second agreement in 1757 bringing Prussia into the war. Spain became