The Armada belonged to the wider Eighty Years' War rather than an isolated invasion story. The Dutch provinces were economically valuable to a Habsburg monarchy repeatedly strained by the cost of fighting across several fronts. Religion mobilized support, while taxation, urban and noble privileges, and resistance to centralization created the underlying instability in the Habsburg Netherlands. England mattered because it could support Protestant resistance and complicate Spain's effort to preserve control of this wealthy region.
Chapter · 3:34-9:14
The Dutch Revolt behind the Anglo-Spanish war
The wider conflict grew from Habsburg finances, Dutch privileges and taxation, and Reformation-era religious division.