Which major transformation took place in the Cayman Islands after 1966?

The major transformation that took place in the Cayman Islands after 1966 was the establishment of tourism as a primary industry. This shift significantly changed the economic landscape of the islands, as prior to this transformation, the economy was largely dependent on agriculture and fishing.

The 1960s marked the beginning of an organized effort to promote the Cayman Islands as a tourist destination, leading to the development of infrastructure such as hotels, restaurants, and attractions that catered to visitors. This not only brought an influx of tourists to the islands but also created numerous job opportunities for locals, thereby improving the standard of living and overall economic development.

While the other options may pertain to developments in the Cayman Islands, they do not accurately reflect the major transformation that defined that era. The islands did not achieve full independence at that time, nor did they formally join the United Nations in 1966. Additionally, significant banking regulations were introduced later as the financial sector grew, but it was the rise of tourism that fundamentally transformed the local economy and society during this period.