The correct answer to this open question is the following.
The people of the Soviet Union staged a revolution against Mikhail Gorbachev leadership. Russian people revolted against the government. That is how the people of the Soviet Union reacted to the independence of many Eastern European countries.
In those moments, the Soviet Union was about to collapse. On December 25, 1991, the Soviet Union broke up into 15 states, all independent from the USSR. Gorbachev's politics such as the Perestroika and Glasnost allowed many changes in the former Soviet Union. Inhabitants of the Soviet Union were upset for many reasons, basically for the economic problems of the country that directly affected their daily lives.
Map showing the line of demarcation between Spanish and Portuguese territory, as first defined by Pope Alexander VI (1493) and later revised by the Treaty of Tordesillas (1494). Spain won control of lands discovered west of the line, while Portugal gained rights to new lands to the east.
