Last one because everyone started building navies, so everyone else started building navies in order to defend against other navies.
I believe legal alien is the answer you desire.
The trade goods exchanged across Afro-Eurasia during this second Silk Roads era, including ceramics, textiles, foods, spices, and high-value art, were impressive. But as was the case with the first era, religious exchanges were perhaps of even greater significance to world history.
Explanation:
They focused on all the good imports