If you want to look at it this way, you might say that one of the decisions
that led to conflict between the Israelis and Palestinian Arabs was a resolution
passed by the United Nations in 1947, which created two individual states
within Palestine.
What actually led to conflict was the unfortunate fact that the Israelis
wholeheartedly accepted the resolution, and declared the independent
sovereignty of Israel in May 1948, whereas the Arabs never accepted
the presence of a Jewish state in their neighborhood.
At the moment the Israelis declared their land a new country, the armies
of six surrounding Arab nations invaded Israel, with the stated purpose of
driving the Jews into the sea and taking back the land. Somehow, those
military forces managed to lose that conflict, as well as their further military
invasions in subsequent years, but in the 70 years since, they have never
given up their dream of destroying Israel. So we shouldn't think that the
conflict all goes back to something the UN did 70 years ago.