I want to know the answer to the following question:
Many German-born Londoners were British citizens by birth due to what?
All the background I'm provided with is that "The 2011 census recorded that 2,998,264 people or 36.7% of London's population are foreign-born making London the city with the second largest immigrant population, behind New York City, in terms of absolute numbers.". Is that enough to answer the question?