What is "overall cultural creativity"?

[Goooodman]

This text is from TOEFL.
Pacific islanders are variously thought to have come from North America, South America, Egypt, Israel, and India, as well as Southeast Asia. Many older theories implicitly deprecated the navigational abilities and overall cultural creativity of the Pacific islanders.
What is "overall cultural creativity"?

 

[grassy]

On the whole, they were creative in their cultural expressions (e.g. their art). I'm sure the text gives some examples of that.