Read this: In 1579 a number of the northern provinces of the Low Countries signed the Union of Utrecht, in which they promised to support each other in their defence against the Spanish army. This was followed in 1581 by the Act of Abjuration, the declaration of independence of the provinces from Philip II.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): In what year did the provinces of the low countries sign the Union of Utrecht?
unanswerable