Context: The Anglo-Spanish War was a conflict between the English Protectorate under Oliver Cromwell and Spain, between 1654 and 1660. It was caused by commercial rivalry. Each side attacked the other's commercial and colonial interests in various ways such as privateering and naval expeditions. In 1655, an English amphibious expedition invaded Spanish territory in the Caribbean. The major land actions took place in the Spanish Netherlands. In 1657, England formed an alliance with France, merging the Anglo-Spanish war with the larger Franco-Spanish War. The war officially ended with two peace treaties which were signed at Madrid in 1667 and 1670.

Question: How many years apart were the two peace treaties that ended the war?

Answer:
3