Germany spent a lot of money. The reunification of East Germany and West Germany was not easy. This process was full of twists and turns, and there was also a game between Western countries and Russia. The two Germanys represent different camps, and the alliance is a compromise between the two camps.
Between the two Germanys, many people had their families isolated due to the existence of the Berlin Wall at that time, so many people wanted to unite very much. First of all, after Germany was unified, an article was added to the constitution immediately. The general meaning is that from now on, all German territory will return to Germany, and Germany will not have any territory elsewhere. You must know that at that time, a lot of territory in Germany was occupied by Poland and the Soviet Union.
Prussia, the birthplace of Germany, was divided between the Soviet Union and Poland. The reason why Germany added this is to gain the support of other countries. Later, Britain, France, the United States, and the Soviet Union signed a treaty ending their occupation of Germany. Secondly, when Germany was reunified, it did not mean that it would be reunified in a good way. The most important thing was the consent of the Soviet Union. Because West Germany annexed East Germany at that time, the United States and other Western countries must have agreed to it to enhance their own strength. But this is not necessarily the case for the Soviet Union. In order to win the Soviet Union's consent, West Germany promised to provide the Soviet Union with a large amount of loans and aid. Only the Soviet 15 troops that remained in East Germany before the reunification of Soviet Germany will be withdrawn.
At that time, the United Kingdom, the United States, and France all stated that if the Soviet Union could agree to the merger of the two Germanys, then there would be no problem with the merger of the two Germanys. Therefore, Germany could only place its hopes on the Soviet Union. At the same time as the alliance, the Soviet Union also put forward conditions.