Answer and Explanation:
After the Second World War, the city of Berlin, Germany, faced several socioeconomic problems that made life very difficult for all citizens. In this scenario, the USA, decided to promote economic aid so that the city could get back up and face its problems. However, at that time the USA was facing a Cold War against the USSR that also had interests in the city of Berlin. This caused the US to dominate one side of Berlin, called West Berlin, while the USSR dominated the other side, called East Berlin. West Berlin received a great economic incentive, it became a democratic city with a capitalist economy, while East Berlin established a communist economy, but it did not have as much economic support and it developed in an inferior way in relation to East Berlin, continuing with several socioeconomic problems. This caused a great political instability to be established in the city, in addition to promoting a great migration of people who left East Berlin to try life in West Berlin, which worsened the economic problems of East Berlin, which was left without labor . In this scenario, the USSR accused the USA of promoting the problems of East Berlin with a strong imperialist campaign, while the USA accused the USSR of causing serious problems to the citizens of Berlin.
This dispute led to the construction of the Berlin Wall, which separated the two sides of the city once and for all and prevented complete communication between the people on each side.