Whatever you say. We all know you'll go crying to Germany and let them fight your battle.
Archduke and heir to the Austro-Hungray empire, Franz Ferdinand, and his wife Sophie are shot and killed by a Serbia assasain, which starts WWI. From that point forward, Serbia and Austro-Hugray race to find Allies, such as Ruissia and Germany, for the war that would inevitably follow.
WE WILL FIGHT!!
On July 28'th, 1914, the day Austria-Hungary finally declared war on Serbia, WWI officially made its way into the world. The two sides that would be fighting were known as the Allies, starting with Russia and Sebia, and the Axis, starting with Germany and Austria-Hungary.
Arguably the worst battle in WW1 history, the Battle of the Somme began in the 2'nd year of the war, and lasted for 4 months. In the first day alone, many lives were lost and progress was slow. It was a battle that only Germany, France, and Britain would fight, but it was a horror of its own kind, even with 3 countries fighting it.
November 11, 1918
Until Germany brought war to Britain in the seas, Britain's Royal Navy was unchallenged and second-to-none, compared to other countries. Although, at the end of January in the year 1917, Germany started producing ships that would take it all to the next level. In a matter of time, Germany changed the tides of the war and started war in the seas.
When the U.S had begun to enter WWI, they had believed that after this war, there wouldn't be another and all will be well. So, soldiers entered to fight for that cause, and on the Allie side. However, it didn't stop WWII from happening.
After a long 4 years of fighting on both land, sea, and in the air, the war finally ended. But, unlike what people had thought, it wasn't by surrender. Instead, the two sides agreed for an armistice that will end the terror. In the events that followed, the leaders of the countries negotiated a Treaty that would hopefully prevent future wars.