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>
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The Sparks expedition <span>included astronomer Thomas Freeman, traveled to present-day Oklahoma and was forced by the Spanish to cease exploration and return to the established American territory.</span>
