 
 <prompt> Wetin di provinces do make Union of Utrecht official? Given di previous question, write context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: In 1579, some northern provinces for Low Countries sign the Union of Utrecht, wey dem promise to support each other for defence against Spanish army. Dis one follow for 1581 by the Act of Abjuration, the declaration of independence of the provinces from Philip II. 