Answer:
it's D it was hard to defend
Mikhail Gorbachev was the leader who's policies included glasnost and perestroika. Mikhail Gorbachev was the last leader of the Soviet Union and was the only general secretary in the history of the Soviet Union to have been born after the October Revolution. Glasnost can be translated to transparency, as it was the term to describe that press and the public can attend court hearings and that the sentence would be read out in public. Perestroika can be defined as the restructuring of the political and economic system in the Soviet Union.
There are several ways in which the U.S. increased western settlement in the 1800's, but by far the most important action was the creation of the Homestead Act.