Silver
It began to decline after an influx of bullion (gold/silver) into the country after the discovery of the new world which caused inflation and wrecked spain's economy.
Many ships carrying gold, silver, and precious stones to Spain were lost.
Many ships carrying gold, silver, and precious stones to Spain were lost.
The influx of silver from the New World did increase inflation rates from earlier periods. One result was that wages could no longer keep up with the cost of living increases, particularly for increasingly expensive foodstuffs
(Not me) I would say that Spain gained a fortune from the bounties from their colonization of the new world. After all, they controlled most of the southern half of what is now the United States, and also controlled the entirety of South America.
Spain's power began to decline because of the defeat of the Spanish Armada, influx in gold/silver income, much fighting over wealth and losing the battles, and not many colonies or vice-royalties to rely on for agricultural income.
The Spaniards gained vast wealth in gold and silver, emerging as a major European power.
the population of Spain in the 15th century was 178,000,000,000
You mean to Spain? Mexico was the "jewel of the crown", providing 40% of the Spanish Empire's income since the mid 16th century until the early years of the 19th century. Its main resources were rich gold and silver mines, which are still productive to date. It is estimated that by the end of the 16th century, Spain had received the equivalent to US$1.5 trillion in gold and silver.
By the late 16th century American silver accounted for one-fifth of Spain's total budget.
Although it is not generally agreed that the influx of gold into Spain destroyed it, some have theorized that the sudden increase in the amount of gold in circulation caused inflation resulting in an economic crisis in Spain.
Spain expelled the Muslim Moors in the 15th century.