Q: In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
Your question should include an event, or ask about an event, and should not be a yes/no question.
Passage: But that euphoria gave way to despair just over a year later, after voters in France and the Netherlands rejected the Union's painstakingly prepared constitution and plunged it into its deepest political crisis. Part of the reason for the "no" vote, was the perceived threat among the public of foreign workers or immigrants flooding into a Europe ill-prepared to absorb more member states, most of them poor by comparison.
A:
What event has already finished?