Answer:
mainly wood and sometimes iron
Explanation:
In order to be naturalized an applicant must first be qualified to apply for citizenship
Zheng He's first voyage (1405-1407) began in July 1405. They set sail from Liujiagan Port in Taicang of Jiangsu Province and headed westward. The fleet had about 208 vessels total, including 62 Treasure Ships, and more than 27,800 crewman. They traveled to present day Vietnam.
Christianity? I’m not so sure but I think this is the awnser