Answer:
Fishing
Explanation:
An important activity on the Samoan island in the 1920s is FISHING.
This is because Samoan Island is surrounded by water. The area is considered to be part of Polynesia and Oceania in the area of the South Pacific.
During this time, with little or no form of technological equipment, many of the Samoans were discovered to be fishermen.
Hence, in this case, the answer is "Fishing."