Upset by the fast and astonishing growth of the power of the Republic, the American invaders hastened the preparation of an aggressive war in order to destroy it in its infancyThe American imperialists furiously carried out the war project in 1950The American invaders who had been preparing the war for a long time, alongside their puppets, finally initiated the war on June 25th of the 39th year of the Juche calendar. That dawn, the enemies unexpectedly attacked the North half of the Republic, and the war clouds hung over the once peaceful country, accompanied by the echoing roar of cannons. Having passed the 38th parallel, the enemies crawled deeper and deeper into the North half of the Republic...the invading forces of the enemies had to be eliminated and the threatened fate of our country and our people had to be saved. Required:
According to the above passage, how did the Korean War start?