President ronald reagan and mikhail gorbachev:
disagreed about the policy of perestroika
agreed to eliminate certain types of soviet and american missiles in europe
agreed to destroy the berlin wall
reunited east and west germany

Generally speaking, President Ronald Reagan and Mikhail Gorbachev "agreed to eliminate certain types of Soviet and American missiles in Europe," since this was embodied in the "Intermediate-Range Nuclear Forces Treaty" which was signed by the two leaders. 

Athe rate increases as income increases

Both countries had to aprove annexation.