Richard Nixon's presidency had profound effects on American foreign policy, marked by significant events such as detente with the Soviet Union and the opening of relations with China. His administration introduced the policy of realpolitik, focusing on practical rather than ideological considerations in foreign affairs. The withdrawal of troops from Vietnam was a pivotal moment in his presidency, aimed at alleviating public pressure and ending a divisive conflict. However, the Watergate scandal ultimately overshadowed his foreign policy achievements and led to his resignation, altering the public's trust in government.