What was one reason for Spain's decline in power?

Spanish power and prosperity declined aafter the defeat of the spanish.

Explanation:

Through the 1600's, Spain's strength decreased. One of the reasons was that Philip II's sucessor wasn't suited for the job. Then there were economic problems also brought the decline Treasures from the Americas led Spain to neglect farming and commerce. Also the government hevaily taxed the small middle class, weaking a group that in other European nation supported royal power. The Spanish power dqindled in the 1600's and 1700's.