Crap, I can't remember the author or the title of the book , I lost the book.

Anyway, in this anonymous book the historian basically said it was a case of imperial overstretch.
In the period of Charles V and Phillip, vast wealth was flowing in from the New world, but it all was flowing right back out to pay debts. The costs of trying to hold onto the Spanish and Austrian Netherlands, Holding the holy Roman Empire together, trying to roll back the protestant reformation, cost enormous sums-- and unfortunately were ultimately futile. You probubly know about the Spanish Armada. That expedition cost a staggering sum, and it gained ---nothing.

It didn't help that the Spanish were spread really thin in their non-european possessions.
Apparently old Spain was not the richest or most cosmopolitan kingdom in Europe --- or maybe it was ( ? ) because the Spanish people had a marked inclination to STAY HOME.
They did not emigrate to America in droves like the English, Scots, Irish and Germans.
sailors, mercenaries, priests, a few business men, went out to the colonies. But real colonists, white laborers and farmers, women and children, did not go in any significant numbers.