Why was Spain so powerful in the 16th century?

Spain's power in the 16th century stemmed from its vast overseas empire, which included colonies in the Americas, where immense wealth from silver and gold mining significantly boosted its economy. The unification of the Spanish Kingdom under Ferdinand and Isabella, along with the conquest of territories like the Aztec and Inca empires, expanded Spain's influence. Additionally, Spain's strong military, exemplified by its powerful navy and the formidable Spanish Armada, allowed it to dominate European politics and trade routes during this period. This combination of wealth, territorial expansion, and military strength established Spain as a leading global power in the 16th century.