It’s been decades since the issue of confederation between the Kingdom of Jordan and Palestine was a matter of public debate. The idea gained traction in the mid-1980s and early 1990s as the rift between Jordan and the Palestine Liberation Organization narrowed and King Hussein and Yasser Arafat appeared to reconcile their differences. In principle, the two leaders agreed that once the state of Palestine is born, it will choose to join Jordan in a confederation between two sovereign states.
But the Oslo process, leading to direct secret negotiations between the PLO and Israel that resulted in the signing of a "declaration of principles" on the White House lawn in 1993, put the idea on hold. Jordan went on to sign its own peace deal with Israel in 1994, and the Palestinians were caught in endless and often fruitless negotiations with Israel under US auspices. That process took a nosedive following the second Palestinian intifada in 2000 and the death of Arafat in 2004.