It was called the Act of Abjuration.

It deposed Philip from his sovereignty, but was not the proclamation of a new form of government, for the united provinces were not ready to dispense with an hereditary chief.

Unluckily, they had already provided themselves with a very bad one to succeed Philip in the dominion over most of their territory, while the northern provinces were fortunate enough and wise enough to take the Father of the country for their supreme magistrate.
The document by which the provinces renounced their allegiance was not the most felicitous of their state papers.

It was too prolix and technical.

Its style had more of the formal phraseology of legal documents than befitted this great appeal to the whole world and to all time.