Step 1: Understanding the Concept:
The Non-Aligned Movement (NAM) is a forum of 120 developing world states that are not formally aligned with or against any major power bloc.
It was established during the Cold War as an organization of states that did not seek to formally align themselves with either the United States or the Soviet Union, but sought to remain independent or neutral.
Step 2: Detailed Explanation:
The first summit of the Non-Aligned Movement was a landmark event that formally established the movement.
This inaugural conference, known as the Summit Conference of Heads of State or Government of the Non-Aligned Movement, was held from September 1 to 6, 1961.
The host city for this historic summit was Belgrade, which was then the capital of Yugoslavia.
The key founding leaders, including Josip Broz Tito of Yugoslavia, Jawaharlal Nehru of India, Gamal Abdel Nasser of Egypt, Kwame Nkrumah of Ghana, and Sukarno of Indonesia, were instrumental in organizing this summit.
Thus, Belgrade is the correct answer.
Step 3: Final Answer:
Based on historical records, the first Non-alignment Summit was held in Belgrade.