On October 3rd, 1989 both East and West Germany were controlled by the Allied Powers and the Soviet Union, respectively. Many citizens were excited for reunification, but they did not anticipate the ramifications of unifying two different political ideologies into one entire nation would create. The problematic effects would be Economic Effects, Political Effects, and The Effects on Citizens from both East and West Germany.
On the Economic Effects tab will explain all the Economic Effects that East Germany had on West Germany. Such as the amount of pollution that occurred in East Germany that West Germany had to spend massive amounts of money to solve. Or the rise of the unemployment when the two countries unify into one. There is much more economic effects that rose after reunification.
While on the Political Effects tab will tell you about two different political ideologies would have to unify in order to form one government over Germany. Regulations from the former GDR, Stasi, would be completely changed in order to comply with the regulations of West Germany. The political struggle between both countries would result in conflicting views.
Lastly, on the Effects on Citizens tab it explains how excited people were from East and West Germany were for reunification. Afterwards, with the economic and political problems occurring caused people from both sides would have nostalgia about great it was before reunification. This would result in hostility between the people from East and West Germany. Overall, all of these effects would result to be a problem for the newly formed country after reunification.