The assassination of the Archduke was important because it marked the start of WW1. Austria-Hungary then declared war on Serbia[the assassins] and because of all the treaties the countries have, it turned into a world war.
battle of somme , Romanioa declared war on centeral powers
The British declared war on Germany on August 4, 1914, officially entering WWI.
Spain was neutral in WW1
WW1 started in 1915 on the 25th of April. If your talking about when or who declared war first, I think it was Germany but I don't know when.
Austria-Hungary declared war on Serbia at the start of World War I.
The US remained neutral. It declared war in 1917, three years into the war.
The assassination of the Archduke was important because it marked the start of WW1. Austria-Hungary then declared war on Serbia[the assassins] and because of all the treaties the countries have, it turned into a world war.
World War I was directly started by the assassination of Austria's Archduke Franz-Ferdinand by a Serbian terrorist group. Austria-Hungary declared war on Serbia first.
WW1 started in 1914
battle of somme , Romanioa declared war on centeral powers
the USA declared war on Germany,making the US a part of ww1
Austria-Hungary declared war on Serbia and it pretty much snowballed from there.
Technically WW1 did not start out as a world war, it started out as the Austrain heir was murdered in the capital. The austrians thought that the serbians were behind it and asked Germany (they were allies) to back them up if war broke out. Then Serbia asked Russia to back them up if war broke out. Austria then declared war on Serbia, same with Germany. Then Russia came in because Serbia was attacked then France and England came in because Germany declared war on them. Then, as you know, WW1 was born in a sea of flames. I hope this answered your question.
Just after the Civil War or WW1.
The civil war was an un-declared war fought against ourselves. WW1 was a declared war fought against a foreign nation.
President Woodrow Wilson declared war on Germany in World War I on April 6, 1917.