Created in 1945
headquartered in new york city
192 countries are members
general assembly and security council are its two main bodies

these are all describing which international group?

The correct answer is the United Nations. As of now however, there are 193 countries, which is a lot more than in 1945 when there were 51 member states. The territory in New York where the headquarters are are considered to be international territory. It is the most famous international organization in the world.