Imperial glory

In Imperial Glory, the 1914 assasinations in Sarajevo have failed, and speculates what would the world be like if the European empires had a longer hold on their colonies and territories instead of a world war.

This is my first attempt at an alternate history, so please, use "constructive criticism" and try to give me some ideas!

The Assasination Attempts of June 28
On June 28 1914, tragedy gripped the people of Sarajevo as they mourned the deaths of dozens of people killed in an attempt to assasinate archduke Franz Fernidad. In the morning of that day, the assasins, Cvjetko Popović, Gavrilo Princip, Trifun Grabež, Vaso Čubrilović, Mehmedbašić and Čabrinović arrived in the city with their bombs and their pistols, ready to kill as many Austrian officials as possible before taking cyanide pills and dying. All of the assasins failed to act except Čabrinović, failed to act. When the archduke's party passed Čabrinović, he threw a bomb at the lot, but the bomb bounced off the side of the car the archduke was riding in and the timed bomb exploded in a crowd. Čabrinović became hysterical, took the old cyanide pill that only made him very uncomfortable and jumped in the river that was a few inches deep. The authorities dragged him out and he was beaten severely before being taken into custody. The archduke arrived at the town hall and gave his speech along with the mayor, and then got in the car for a small tour of the city. Having learned what had happened, Princip went to get a sandwich in a small eatery. The cashier glanced at his pistol, raised an eyebrow but did not object, and Princip sat down to eat his sandwich in the store. When the archduke passed by the store, Princip was shocked and did not have time to draw his gun and fire. When he ran out the door, the archduke was already gone. Princip shot himself on the spot and fell to the ground. When the other assasinators had also learned that the assasination had completely failed, and either shot themselves and died or when on a shooting rampage and then died. Many did get hurt and died in the assasination attempt, but it was written off by the police as a mass shooting rather than an assasination attempt as to not cause panic. The assasination completely failed and all involved were either dead or in jail.