The immediate or proximate cause of war was the assassination on 28 June 1914 of Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne, by Gavrilo Princip, a Serbian nationalist. Austria-Hungary's resulting demands against the Kingdom of Serbia activated a sequence of alliances. Within weeks the major European powers were at war; their global empires meant that the conflict soon spread worldwide.
The Nazis invaded Poland and this was the start of World War 2. Other countries declared war on Germany because of what they did to Poland and because he violated the Treaty of the Versailles.
Great Britain and France declared war on Germany, when Germany invaded Poland - so began the second World War in Europe.
a problem with ww1 was that most European countries were bound by ally agreements. When only 2 countries officially declared war on each other their allies were forced to join the war.
The catalyst for World War I, the assassination of Archduke Ferdinand of Austria and his wife, occurred on June 28, 1914. Despite military and diplomatic action immediately following the assassination, war was not officially declared for another month. On July 28, 1914 Austria-Hungary declared war on Serbia. In an almost domino effect, country after country followed suit, declaring war on each other throughout the month of August, until the majority of Europe was consumed. The United States did not enter the War until 1917. For a more thorough look at the outbreak of World War I, visit The Encyclopedia Britannica's website and their entry on World War I.
The Austrian-Hungarians were first to declare war with the Serbs.
The U.S. officially declared war on December 8th 1942.
We entered the war in 1941 after the attack on Pearl Harbor. And then after we declared war on Japan, Germany and Italy declared war on us, officially starting WWII.
No.
Austria-Hungary declared war on Serbia at the start of World War I.
The United Kingdom officially declared war on Germany on August 4, 1914, thereby entering World War I.
lthe Canadian army killed all of the German soldiers and declared the winnig of the second world war
England and France declared war on Germany after it invaded Poland on Sept 1, 1939.
The USA became legally and officially involved in World War 2 when the Japanese Forces bombed Pearl Harbor, Hawaii on 12-7-1941. The next day the Congress and President Roosevelt declared war on Japan for the unprovoked attack by Japan upon the USA. A week later Adolf Hitler, leader of the Nazi Germans, declared war on the USA thus putting the US in the European War officially.
August 1914
The United States Congress officially declared war on Germany on April 6, 1917. President Woodrow Wilson asked for a declaration on April 2.
WWII was America's LAST declared war.
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