Throughout the Empire of Britannia the normal day of the work in London rumors of armed soldiers and gunshots near the Charing Cross Road could be heard from the older folks while they worked, there an Muggle born named David Jones who was home for the summer till Hogwarts started back up. It was a completely average day till his mother called him inside since the King was making an emergency broadcast.
King George-"I am saddened to make this broadcast as it is with a heavy heart I have to announce an attempt on my life was made, this was not made by the Nazis but rather a member of our own nation. He was not just a normal member of our great nation rather a wizard that had taken to the banner of a Wizard named Gellert Grindelwald. Now many of you think me mad, but for the past 248 years mages have been separate from mundane kind with them all sorts of magical creatures and sentients. But with the attack on my person a treaty that is older than that secret has been broken thus I am able to make this announcement, by the power of magic and the agreement of 1558 I announce the disillusion of magical Britain and with it any mind alerting spell cast on her mundane citizen so mote be."
With that a wave of magic covered the entire of Britain and suddenly a numerus castles, manors and home thought lost or abandoned had popped into memory. In addition a lot of people had memories of siblings or family members that they thought missing had actually moved or died on the magical side.
King-"Now, a great number of you now remember whole chunks of your life or family members that you previously didn't. I have a request of you please do not lash out at these people as they are just like you with extra abilities, even now a great number serve in the military of our nation.
Their is also a another war underneath this one, one of wizards it too is headed by a mad man who wishes to to take control over the world.
With this massive change in our nation I or one of my administration will speak on the radio giving information on what Wizards are and what the future holds. God bless the Empire and God bless us all."
David, sat their in silence looking at his parents and thought about the future, as his plans a very much changed.
Away from London and Britains the world heard the same announcement, most juts thought it an fake till questioning the British ambassadors that yes, magic is real and they themselves have a magical population.
All over Africa who still had a close relationship with their magical population had very little upheaval when their government's announced the same. Ethiopia who was under siege of the Italians conscripted their Wizards to defend their nation, they earned the title of the first mages to fight in the war "officially".
On main land Europe French mages, began to join the rebellion. Germany began to erupt into a civil war as Nazi mages tried to seize their ministry but failed.
In China in the forbidden city opened it walls and Zhu Yuanzhang, the Hongwu Emperor of China announced that he was alive and well, he and his immortal guard would begin to unite China under his rule.
In America Roosevelt announced that the MACUSA and mundane congress would be uniting, but they had their own issues as the magical side did not have anything close to segregation based off race and their was a female magical president even. They also had a lot to say about now the native people were treated.
Latin America where Catholicism had the most power, wizards and witches fled the cities to the mountains and jungles in hopes of surviving the fighting as they erupted in riots.
The world would eventually calm down as they were forced to when Britain went on the offensive and it would be loud.