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Foreign. 2026 on April 4, 1949, representatives from 12 countries in Europe and North America, Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom and the United States signed the North Atlantic Treaty, creating the North Atlantic Treaty Organization, or NATO. This defensive security alliance has been a key institution for world stability since World War II. In the wake of that war, the US and its allies recognized the crucial importance of peacetime alliances to deter future wars. To stop the spread of communism across war torn Europe, the United States backed a massive financial investment into rebuilding Europe. President Harry S. Truman signed the European Recovery Program, better known as the Marshall Plan, into law on April 3, 1948. Quickly, though, it appeared that economic recovery would not be enough to protect a democratic European. The expansion of Soviet style communism prompted officials to consider a pact that would enlist the United States to stand behind the security of Western Europe. Crucially, though, they wanted it to stand outside the United nations, where the Soviet Union could exercise veto power. The outcome was the NATO alliance. NATO guaranteed collective security because all of the member states agreed to defend one another against an attack by a third party. Article 5 of the treaty requires every member nation to come to the aid of any one of them if it is attacked. That article has been invoked only once after the September 11, 2001 attacks on the United States, after which NATO led troops went to Afghanistan. Over the years, the alliance has expanded to include 32 countries. In 1999, Poland, Hungary and the Czech Republic, all former satellites of the USSR joined NATO over the protests of Russia, which was falling under the control of oligarchs who opposed Western democracy. More countries near Russia joined NATO in the 2000s, and Finland and Sweden have joined since Russia's full scale invasion of Ukraine Finland three years ago tomorrow. In fact, when NATO formed, the main concern of the countries backing it was resisting Soviet aggression. But with the fall of the Soviet Union and the rise of Russian President Vladimir Putin, NATO resisted Russian aggression. Instead, in 1949, when he signed the treaty, President Truman called the pact a positive influence for peace. That peace was first of all among the nations signing the agreement. They were, he said, agreeing to abide by the peaceful principles of the United nations, to maintain friendly relations and economic cooperation with one another, to consult together whenever the territory or independence of any of them is threatened, and to come to the aid of any one of them who may be attacked. If such an agreement had been in Place in 1914 and 1939, supported by the nations who are represented here today, he said, I believe it would have prevented the acts of aggression, which led to two world wars. With NATO, Truman said, we hope to create a shield against aggression and the fear of aggression, a bulwark which will permit us to get on with the real business of government and society, the business of achieving a fuller and happier life for all our citizens. NATO countries agreed to stand together to withstand aggression from outside the pact. Truman emphasized the difference between the NATO countries and the authoritarian system against which the alliance stood. The NATO countries could stand together without being identical. There are different kinds of governmental and economic systems, just as there are different languages and different cultures. But these differences present no real obstacle to the voluntary association of free nations devoted to the common cause of peace. He said it is possible for nations to achieve unity on the great principles of human freedom and justice and at the same time to permit in other respects the greatest diversity of which the human mind is capable. The experience of the United States in creating one nation out of the peoples of many lands proved that this idea could work. Truman said. This method of organizing diverse peoples and cultures is in direct contrast to the method of the police state, which attempts to achieve unity by imposing the same beliefs and the same rule of force on everyone. The NATO countries did not believe that war was inevitable. Truman said. Men with courage and vision can still determine their own destiny. They can choose slavery or freedom, war or peace. I have no doubt which they will choose. The treaty we are signing here today is evidence of the path they will follow. If there is anything certain today, if there is anything inevitable in the future, it is the will of the people of the world for freedom and for peace.
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Letters From An American was written and read by Heather Cox Richardson. It was produced at Soundscape Productions, Dedham, MA. Recorded with music composed by Michael Moss.
Host: Heather Cox Richardson
Date: April 4, 2026
In this episode, historian Heather Cox Richardson narrates the origins, purpose, and evolution of NATO—the North Atlantic Treaty Organization—on the anniversary of its founding. She explores the alliance’s historical significance, its expansion, and how it continues to serve as a bulwark for democracy and peace in the face of changing global threats.
On the intent of NATO:
"NATO guaranteed collective security because all of the member states agreed to defend one another against an attack by a third party." — Heather Cox Richardson (01:28)
On unity and diversity:
"It is possible for nations to achieve unity on the great principles of human freedom and justice and at the same time to permit in other respects the greatest diversity of which the human mind is capable." — President Truman, quoted by Richardson (04:37)
On the future:
"If there is anything certain today, if there is anything inevitable in the future, it is the will of the people of the world for freedom and for peace." — President Truman, quoted by Richardson (05:42)
This episode offers not just a history lesson but a meditation on the ongoing importance of alliances grounded in shared values, showing how the structure and spirit of NATO remain relevant in today’s world. For listeners seeking context on ongoing international tensions and the United States' role abroad, Richardson's historical perspective sheds valuable light on why NATO endures.