The Corruption of the Ministry of Magic happened shortly after the election of Seamus Finnegan. Former Minister, Dean Thomas  tried to cover up Aberforth Dumbledore and Harry Potter’s information about Lord Voldemort’s return. The European Union of Wizards agreed with Dumbledore, which caused Thomas to secure the Americas, placing them in a sub council. This made wizards of the west, less represented within the Ministry, and so most of the problems that they had were not heard by the Minister. This frustration led to the European Spilt, run by some of the greatest wizards of that time.