The legacy of communism and unemployment has led to mass internal migration in Germany from what was East Germany to what was West Germany.
Explanation:
Between the end of World War II and the beginning of the 1990s, Germany was not united, instead, it was divided into two parts. One part, the larger one, was made up of Western Germany, while the smaller part was made up of Eastern Germany. The parts of Germany during this period had totally different trajectories, with West Germany becoming a developed Western country, while East Germany was ruled by communism.
Western Germany quickly managed to bounce back from the destruction of World War II, its economy was constantly growing, and the country was a democracy. Eastern Germany was going from worse to worse, with a communist authoritarian government and a terrible command economy, the people were barely surviving. When the conditions were right and the two countries united into one again, there was a mass internal migration from what was East Germany to what was West Germany, with people trying to find better jobs and opportunities in life. Even nowadays, it can easily be seen that former East Germany is still far behind the former West Germany part of the country.