archduke Franz Ferdinand got assassinated, and all his allies attacked the country where the assassins were from, and then all of those countries allies attacked the allies of the countries attacking their ally, and then there was trench warfare in Europe, first tanks came around, poison gas was used and was very deadly, and in the end Germany got their butt kicked
A written legal code would be am improvement over an oral set of laws because citizens may forget laws, depending on how much there are. Having them written, where everyone can read it, may help them better understand and remember the acts/laws.
Answer:
It was due to the weaknesses of the Weimar Government.
The reason why Germany declared war on Belgium even though they were a neutral country was because the Germans needed a way to get access to France and the only way to do that was to attack Belgium
Hope this helps! :)<span />