"IT IS CLEAR THAT THE UNITED STATES CANNOT EXPECT IN THE FORESEEABLE FUTURE TO ENJOY POLITICAL INTIMACY WITH THE SOVIET REGIME. IT MUST CONTINUE TO REGARD THE SOVIET UNION AS A RIVAL, NOT A PARTNER, IN THE POLITICAL ARENA. IT MUST CONTINUE TO EXPECT THAT SOVIET POLICIES WILL REFLECT NO ABSTRACT LOVE OF PEACE AND STABILITY, NO REAL FAITH IN THE POSSIBILITY OF A PERMANENT HAPPY COEXISTENCE OF THE SOCIALIST AND CAPITALIST WORLDS, BUT RATHER A CAUTIOUS, PERSISTENT PRESSURE TOWARD THE DISRUPTION AND, WEAKENING OF ALL RIVAL INFLUENCE AND RIVAL POWER.” "LONG-TERM, PATIENT BUT FIRM AND VIGILANT CONTAINMENT OF RUSSIAN EXPANSIVE TENDENCIES." Which of the following events would most directly support the ideas in the excerpt?

"IT IS CLEAR THAT THE UNITED STATES CANNOT EXPECT IN THE FORESEEABLE FUTURE TO ENJOY POLITICAL INTIMACY WITH THE SOVIET REGIME. IT MUST CONTINUE TO REGARD THE SOVIET UNION AS A RIVAL, NOT A PARTNER, IN THE POLITICAL ARENA. IT MUST CONTINUE TO EXPECT THAT SOVIET POLICIES WILL REFLECT NO ABSTRACT LOVE OF PEACE AND STABILITY, NO REAL FAITH IN THE POSSIBILITY OF A PERMANENT HAPPY COEXISTENCE OF THE SOCIALIST AND CAPITALIST WORLDS, BUT RATHER A CAUTIOUS, PERSISTENT PRESSURE TOWARD THE DISRUPTION AND, WEAKENING OF ALL RIVAL INFLUENCE AND RIVAL POWER.” "LONG-TERM, PATIENT BUT FIRM AND VIGILANT CONTAINMENT OF RUSSIAN EXPANSIVE TENDENCIES." Who is the author of the excerpt?

"IT IS CLEAR THAT THE UNITED STATES CANNOT EXPECT IN THE FORESEEABLE FUTURE TO ENJOY POLITICAL INTIMACY WITH THE SOVIET REGIME. IT MUST CONTINUE TO REGARD THE SOVIET UNION AS A RIVAL, NOT A PARTNER, IN THE POLITICAL ARENA. IT MUST CONTINUE TO EXPECT THAT SOVIET POLICIES WILL REFLECT NO ABSTRACT LOVE OF PEACE AND STABILITY, NO REAL FAITH IN THE POSSIBILITY OF A PERMANENT HAPPY COEXISTENCE OF THE SOCIALIST AND CAPITALIST WORLDS, BUT RATHER A CAUTIOUS, PERSISTENT PRESSURE TOWARD THE DISRUPTION AND, WEAKENING OF ALL RIVAL INFLUENCE AND RIVAL POWER.” "LONG-TERM, PATIENT BUT FIRM AND VIGILANT CONTAINMENT OF RUSSIAN EXPANSIVE TENDENCIES." Most historians would argue that the philosophy stated in this excerpt ceased to have a significant influence on US foreign policy as a result of which of the following?

"IT IS CLEAR THAT THE UNITED STATES CANNOT EXPECT IN THE FORESEEABLE FUTURE TO ENJOY POLITICAL INTIMACY WITH THE SOVIET REGIME. IT MUST CONTINUE TO REGARD THE SOVIET UNION AS A RIVAL, NOT A PARTNER, IN THE POLITICAL ARENA. IT MUST CONTINUE TO EXPECT THAT SOVIET POLICIES WILL REFLECT NO ABSTRACT LOVE OF PEACE AND STABILITY, NO REAL FAITH IN THE POSSIBILITY OF A PERMANENT HAPPY COEXISTENCE OF THE SOCIALIST AND CAPITALIST WORLDS, BUT RATHER A CAUTIOUS, PERSISTENT PRESSURE TOWARD THE DISRUPTION AND, WEAKENING OF ALL RIVAL INFLUENCE AND RIVAL POWER.” "LONG-TERM, PATIENT BUT FIRM AND VIGILANT CONTAINMENT OF RUSSIAN EXPANSIVE TENDENCIES." The philosophy stated in the excerpt was most directly a reaction to which of the following?