Why do scholars think that the cities of huari and tiahuanaco were affiliated either by trade or religion?

The major reason behind such thinking is the "Artistic Style" which is common in both of these cities.
Huari is a historical civilization in Andean Region which was from approximately 600 AD to 1000 AD while Tiahuanaco in the same region refers to another culture in between 200 AD to 1000 AD.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.

tea which is where the whole thing about dumping it in the ocean came from