Israel was established in 1948 and the UN was established in 1946. Unless Israel possesses a very special DeLorean, Israel could not have founded the United Nations. Conversely, in 1947, the UN General Assembly passed UNGA Resolution 181 (II) which gave the legal legitimacy to the Zionist movement in Mandatory Palestine to declare independence as Israel. The Zionists followed through on this six months later by declaring the independence of the State of Israel.
Israel has been a member of the United Nations since the UN General Assembly voted on the May 11, 1949 with UNGA Resolution 273 (III) to admit Israel to UN membership as a "peace-loving country".
United Nations Day isn't solely an American holiday but a holiday celebrating all of the peoples that came together to form the United Nations. It was the United Nations General Assembly that established the holiday in 1948. The date set for the holiday is October 24th, the same day that the United Nations Charter was adopted in 1945. United Nations Day is just one of the events that take place during United Nations Week which runs every year from October 20-24th. United Nations Day isn't just a holiday to celebrate the beginning of the organization. Its purpose is more to uphold what the United Nations stands for; international economical development, security, social progress, human rights and world peace. Though none of the dozens of UN member states are required to recognize the holiday, the General Assembly did request it in 1971. Since 1946, even before its official inception, every year the U.S. President has proclaimed a United Nations Day. There are also various learning institutions and international schools across the world that recognize and celebrate United Nations Day as a day to show pride in their cultural diversity.
International Year of Deserts and Desertification
2002
1945
1955
1946
1985
1965.
The Dominican Republic is a member country of the United Nations. The United Nations was established in October of 1945, and the Dominican Republic was one of the original members that joined that year.
International Year of Sanitation
Original Answer: Because they are decades away. Improved: The United Nations are not a country. They couldn't have "joined" the League of Nations. The League of Nations was the predecessor of the United Nations - the League of Nations failed, and so, many years later in 1942 (I believe it was that year) they founded the United Nations as an improved "League of Nations."