Post-war U.S. diplomacy after the war was strongly influenced by the executive agreements reached in Cairo, Tehran, Yalta and Potsdam.485 For a time, the formal treaty – the signing of the United Nations Charter and adherence to multinational defence pacts such as NATO, SEATO, CENTRO and others – was restored, but soon the executive agreement , in addition to the agreement or by an initiative of the President. , has once again become the most important instrument of U.S. foreign policy, so that in the 1960s it became clear that the nation was, in one way or another, obliged to help more than half of the world`s countries protect itself. 487 Most executive agreements have been concluded. under a treaty or an act of Congress. However, presidents have sometimes reached executive agreements to achieve goals that would not find the support of two-thirds of the Senate. For example, after the outbreak of World War II, but before the Americans entered the conflict, President Franklin D. Roosevelt negotiated an executive agreement that gave the United Kingdom 50 obsolete destroyers in exchange for 99-year leases on some British naval bases in the Atlantic. The challenge of securing a two-thirds majority on contracts was one of the motivations for the huge increase in executive agreements after World War II. In 1952, for example, the United States signed 14 treaties and 291 executive agreements. These were more executive agreements than those concluded during the century from 1789 to 1889.
Executive agreements continue to grow rapidly. During the 19th century, the government`s practice dealt with the power to terminate contracts as they were shared between legislative and executive departments.205 Congress often authorized206 or instructed the president207 to terminate the contract with foreign governments during that period. In rare cases, the Senate alone passed a resolution authorizing the President to terminate a contract.208 Presidents have consistently complied with the authorization or instruction of the legislative branch.209 On other occasions, Congress or the Senate approved the president`s resignation after the fact, while the foreign government executive had already resigned.210 The notable extension of presidential power in this area was first highlighted in President McKinley`s administration.