Hamburg was salvaged following the destruction of the plant and was part of the GDI-administrated Northern European Blue Zone by 2047.
Hamburg was the last remaining GLA stronghold in world. The city was occupied after the GLA drove out the United States from Europe, with their occupation, the GLA managed to acquire high-tech US weaponry. The Chinese Commander was tasked to drive out the GLA from the city using any means necessary.
After the GLA defeat, Europe and China strengthened ties, establishing the Eurasian Unity League. The remaining GLA leaders were presumably tried and executed for crimes against humanity.