What are the lasting effects of Spanish exploration on both the New World and the Old World?

First of all trade routes were opened, thus introducing new cultures into both areas. Of course, this totally changed the diet of people, which among the other things extended the life of people. On the other side, Europeans brought with them diseases that shortened the population of Americas, which eventually led to decline of the population among Native Americas.

Explanation:

During the Age of Exploration maritime trade expanded to unbelievable heights. Enlarged exchange of products led to the establishment of trade connection with New and Old World. Still, there were also bad sides of this exchange. Slave trade became integral part of the exchanging process, while on the other side Europeans brought with them certain diseases, among which deadliest were smallpox.

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paper money known as continental currency, or continentals.