Oil and other natural resources in Asia
Because you want to introduce the person and give them the red carpet treatment (which you are doing) to show you have respect and they get that
Culture is a way of life of a group of people
I'll tell you the simple stuff, I hope this helps you. For Japan the leader was to be called an emperor or empress who could only be a part of the royal family if they were related to the Shinto sun goddess. As for Europe, the leader was to be called a king or a queen. Like Japan, not just anybody could become royalty. Kings and queens came from a long descent of an Imperial family........