Final answer:
Austria's ultimatum to Serbia was important because it sparked World War I. It took a month for Austria to issue the ultimatum, which allowed for diplomatic negotiations and investigations to take place.
Step-by-step explanation:
The ultimatum issued by Austria to Serbia was important because it sparked World War I. Austria's ultimatum to Serbia was important because it sparked World War I. It took a month for Austria to issue the ultimatum, which allowed for diplomatic negotiations and investigations to take place.
Austria-Hungary demanded Serbian subservience after the assassination of Archduke Franz Ferdinand, and the ultimatum was a way to hold Serbia accountable for harboring the terrorists responsible. It was significant that it took a month for Austria to issue the ultimatum because during that time, diplomatic negotiations and investigations were conducted, which allowed for the possibility of a peaceful resolution to the conflict.