The best and most correct answer among the choices provided by the question is the second choice "the fall of the Soviet Union"
In 1988, Bush ran a successful campaign to succeed Reagan as President, defeating Democratic opponent Michael Dukakis. Foreign policy drove the Bush presidency: military operations were conducted in Panama<span> and the Persian Gulf; the Berlin Wall fell in 1989, and the Soviet Union dissolved two years later.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
