In its early history the United States has an isolatedist opinion on international policy. However, this has changed since the 20th century. The United States is now involved in many international organizations, including the North Atlantic Treaty Organization. "The North Atlantic alliance is based on the treaty that members can freely participate after public debate and appropriate parliamentary procedures.The Treaty provides for individual rights and international obligations under its charter .
The United States is a founding member of NATO, a coalition of 29 countries in North America and Europe, aiming to protect Western Europe from the Soviet Union during the Cold War. According to the NATO Charter, the United States was forced to protect NATO countries attacked by external forces. The United States itself was the first country to call the Union's common defense provision in response to the September 11 attack. Through its history, the United States has taken unilateral and multilateral military action (see the US military action schedule). In the days after World War II, the country had permanent membership and veto power at the UN Security Council and was able to take any military action without formal opposition from the Security Council. Because of the huge military expenditure, the United States is known as the only superpower remaining after the collapse of the Soviet Union.
NATO stands for North Atlantic Treaty Organization. Founded in 1949, it is a military alliance linking America to Western Europe. In the years after World War II, NATO confronted the Eastern European Communist Union Warsaw Pact. Indeed, at the happy moment after the collapse of the Berlin Wall, some politicians promised that there would be a "peaceful dividend" in the form of reduced pressure on expenditure on weapons. I hope that money spent on weapons during the Cold War can be redistributed for other social needs.
So, what is NATO? NATO is a joint defense agreement. That member country is more or less Western democracy. America, France, the United Kingdom, Canada, and other countries formed NATO. The important thing to keep in mind here is that the Warsaw Treaty was born out of the influence of the Soviet Union and NATO was born of the influence of the United States of America. Recognizing the problems caused by Sovietization in Eastern Europe, the United States adopted a broader foreign policy strategy later called containment measures. In short, the purpose of the containment policy is to control the spread of Communism, but there is no need to fight back where it already exists. Containment policies were developed by diplomat George F. Kennan and became a key element of President Harry Truman's foreign policy. Trumanism marks the official implementation of containment policies