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King David united the Israelites into a single nation. He was the second king of the United Kingdom of Israel and Judah.
Israel
The first king was Saul.
Israel
If the entire world united, YES, Israel could be defeated, but Israel's antagonistic neighbors do not currently have the capabilities alone to do this.
There is no such thing as 'The United Nation of Israel', however Israel is a member of the UN. Some people refer to the Davidic and Solomonic Kingdom of Israel as the "United Kingdom of Israel" to avoid confusing it for the later and distinct "Kingdom of Israel". Both of these kingdoms occurred between 1000 B.C.E. and 500 B.C.E. and are unrelated politically to the Modern State of Israel. (This is similar to how the Roman Empire is unrelated politically to the Republic of Italy even though they occupy some of the same territories.)
The United States of America
The present nation of Israel was created on May 14, 1948. David Ben Gurion was the first president. The United States recognized it as a legal nation the same day.
They first called it Canaan, then the Land of Israel, then Israel & Judea, then it was united back to Israel, then The Romans renamed it Palestine, then the Modern Jews named it the State of Israel.
Israel was created in 1948 from the British Mandate of Palestine.
ISRAEL - was awarded statehood by the United Nations in 1948.
The nation of Israel (ישראל)