What important natural resource was located in Persia that would interest Europeans into this region even more so?

The answer is oil.  The Persian Gulf is where most of the oil fields are in the Middle East. Countries like Kuwait, Saudi Arabia and Bahrain as well other countries in the region produce oil that the world relies on to fuel their electricity and vehicles.  It is also found in Arctic but there have been debates as to tap into it because many fear of the environmental damage it would create if something goes wrong

Explanation:

answer: the purpose of the "index of forbidden books" was to prevent the contamination of the faith or the corruption of morals of roman catholics according to canon law, through the reading of theologically mistaken or immoral books. the condemnation of published books, thus listed in the index librorum prohibitorum.

explanation: index librorum prohibitorum, (latin: “index of forbidden books”), list of books once forbidden by roman catholic church authority as dangerous to the faith or morals of roman catholics. publication of the list ceased in 1966, and it was relegated to the status of a historic document.

the 20th and final edition appeared in 1948, and the index was formally abolished on 14 june 1966 by pope paul vi. the aim of the list was to protect the faith and morals of the faithful by putting a stop to the reading of theologically, culturally, and politically disruptive books.

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers