Another Answer:
The Israeli-Palestinian conflict is very complicated. There are Palestinians who live in Israel as Israeli citizens.
Israel never forced the Palestinians to leave Israel. The neighboring Arab countries warned the Palestinians that Israel was going to be attacked. The Palestinians believed that Israel would be destroyed and they would simply return home. Well, that did not work. Israel was not destroyed. Many Jews were under attack in the Arab countries they lived in, so they fled to Israel where they were taken in. The Arab countries in return did not take in the Palestinians that they instructed to leave.
Israel is a democracy, in Israel there are Palestinians who have equal rights. Israel is worried about its safety and therefor is not planning on allowing the Palestinians, who willingly left, return. The Palestinians are taken advantage of by their corrupt leaders and other countries. They are used being used. The Palestinians blame Israel for their misfortune and thus dislike Israel. Because of this, Israel is not willing to freely allow them into the country.
There is an additional demographic reason too, beyond the fact that Jewish people have moved to Israel in a kind of a 'swap'; since the great-grandparents / grandparents / etc of the current generation of Palestinians left Israel, the number of descendants of those original Palestinians has increased beyond the remotest possibility of Israel's capacity to safely re-accommodate them.
They weren't allowed to return when they fled Israel following partition.
King Cyrus.
Around 539 BCE.
Cyrus the Great.
Jesus did not rebuild the temple.
The return from exile predated Jesus by over five centuries.
There are two different important peace plans proposed in 2003. If this is asking about the Geneva Initiative of 2003, it requested for Israelis and Palestinians to return to the 1949 borders with some minor landswaps and a divided Jerusalem. However, the peace plan is much more complicated than that, so please read the Related Link which discusses the peace plan. If this is asking about the Saudi Peace Initiative of 2003, it requested for Israelis and Palestinians to return to the 1949 borders exactly as they were on that date (which is deeply troubling to Israelis especially as concerns Jewish sites in the Old City of Jerusalem) and resettlement of all Palestinians who wish to return to Israel in Israel. In return, the Palestinians are not required to do anything, but all Islamic States will recognize the new Palestinian-majority state of Israel.
King Cyrus the Great.
bc it has no balls lol by faith
Cyrus the Great, the Persian king, allowed the Hebrews to return to Jerusalem following the Babylonian exile. This event is documented in the Bible, specifically in the Book of Ezra, and took place around 538 BCE. Cyrus issued a decree that not only permitted the return but also encouraged the rebuilding of the Temple in Jerusalem, marking a significant moment in Jewish history.
Cyrus, king of Persia.
After defeating Babylon, Cyrus the Great of Persia allowed the Jews (and other people) to return to their homeland in 538 BCE.