1. Franz Ferdinand is the Archduke of Austria-Hungary, an Empire in Europe.
2. He is shot by a Serb, so to get revenge Austria-Hungary declares war on Serbia.
3. Serbia is in an alliance with Russia. To honor the alliance, Russia declares war on Austria-Hungary.
4. Germany is in an alliance with Austria-Hungary. Once Russia declares war on A-H, Germany declares war on Russia to honor the alliance.
5. France is in an alliance with Russia. Once Germany declares war on Russia, France declares war on Germany to honor the alliance.
6. Germany wants to get around French defenses and so invades Belgium, who claimed to be neutral.
7. Britain sees the invasion of Belgium as the first-stage of an attack on them, they are also allied with both Belgium and France. They declare war on Germany to honor their alliances and protect their sovereignty.
8. All of Europe is now at war, along with their colonies all over the world. Japan is also somewhat involved due to being technically allied with the UK.
So you have gangs, let’s say the green gang (UK, France, Russia) and the blue gang (Germany, Italy, mid-Europe, specifically Austria-Hungary). These gangs had policies in place to protect each other although the blue and green gangs got a long lightly and cautiously pre-War. These gangs or members also had associates (ex. Serbia) that they had interests in protecting.
Ferdinand led Austria-Hungary, part of the blue gang. He was assassinated by Serbians and Austria-Hungary blamed Serbia for this and went to war with them. Russia came to the defense of one of it’s associates. This caused other members to come to the defense of their members and associates and war happened.
Very simplistic explanation of a very complex set of actions.
Franz Ferdinand was the heir to the Austro-Hungarian Empire. He was assassinated by members of The Black Hand, a secret society of Serbian nationalists who wanted to unite all Slavic countries, which would first require independence from Austria-Hungary. The Black Hand had support from many higher ups in the Kingdom of Serbia, if not necessarily the government itself.
Austria-Hungary accused Serbia of supporting the assassination, and issued an ultimatum with very harsh terms to Serbia to “investigate” but would actually put them into the A-H sphere of influence.
MEANWHILE, Russia had recently suffered a humiliating defeat in the Russo-Japanese War, and was looking to restore its prestige and influence. The Tsar decided he would be “Protector of the Slavs” and thus back Serbia against Austrian aggression. This gave Serbia confidence to defy A-H.
MEANWHILE Germany had an alliance with A-H, and had told them basically “we trust you, do what you want and you have our support.” This gave A-H the confidence to threaten war even if it would anger Russia.
MEANWHILE the unification and rapid rise of Germany in the previous decades had the other European powers very nervous, and France and Russia made an alliance to protect themselves in case one of them had to fight Germany. This was also supported by Britain, though not officially. France in particular was arguably looking for a reason to fight Germany.
SO:
A-H threatens Serbia, Serbia refuses. A-H declares war on Serbia. Russia declares war on A-H. A-H calls for help from Germany. Germany declares war on Russia, which also means declaring war on France because they are allies.
Germany decides to attack France first because they think Russia will be slow to mobilize. They move their army through Belgium to get around the border defenses in France, expecting Belgium to simply let them rather than fight. Belgium does NOT let them! Belgium calls for help from Britain, citing an old treaty that supposedly guarantees their independence. Britain considers Germany their greatest rival, and so decides to come to Belgium’s aid.
Italy and the Ottoman Empire both see the chaos in the Balkans and each decide to take advantage to gain more territory, joining the war on opposite sides. (Italy had been allied to A-H before but invaded them anyway, since that was the territory they wanted.) Japan did the same thing, except in the Pacific, since Germany had no means to protect its colonies while Britain had naval supremacy.
MEANWHILE, the United States was busy loaning money to fund the war, primarily to Britain. Germany was pissing them off because their naval strategy relied on submarines to attack merchant shipping, which ended up killing Americans. Germany feared the Americans would join the war against them and tried to recruit MEXICO to invade America to keep them busy. When this plot was discovered, America finally had enough of neutrality and declared war on Germany too.
Have you ever lost your temper on someone for something that normally would’ve been pretty small, but it felt like a big deal because there was so much built up tension? Sometimes it’s just two people who are tired and hungry and easily provoked that leads to easily blowing small perceived slights into huge arguments.
Now just imagine that on a global level. The political tension between Austria-Hungary and Serbia at the time of the assassination was extremely high, so when Franz Ferdinand was killed, it was treated as an act of war.
I don’t know enough off hand to explain why that tension existed, but it’s well documented if you want to go read about it. I know I’ve read about it before.
In the exact same way world War 3 will start if we allow Ukraine into NATO right now. Alliances / treaties. When war broke out in Austria their allies were mandated by treaty to defend them, and their enemies allies were mandated to defend them in turn. So you get a fight between 2 parties dragging in everyone else.
Several people have gone through the strict mechanics of what led to the war, but most importantly a lot of people also wanted a war.
Germany in particular saw a war with Russia as inevitable. They saw their chances of winning going down the more time Russia had to industrialize. Germany was eager for war before Russia was too powerful for them to handle, so they were fine with backing Austria if it meant a Balkan war and Russia got involved. Austria wanted a war because they had nothing better to do. France wanted a war to remake Alsace and Lorraine, two provinces taken from them in the franco prussian war.
Oddly enough Russia probably didn’t want the war, but they were also the one with the most control to stop it. If they hadn’t mobilized, Germany likely wouldn’t have mobilized and the whole thing stops. The problem is Serbia would have been left alone with Austria. Ultimately Austria performed like shit, but they still would have likely defeated Serbia. The question is if Russia could have gotten Bulgaria and Romania to assist Serbia. Ultimately though, Russia went in because they had determined they were the protector of the Slavs and had to defend their allies.
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