Why is the quaternary sector not included in the South African GDP​

Among the key sectors that contribute to the gross domestic product and keep the economic engine running are manufacturing, retail, financial services, communications, mining, agriculture and tourism.

As has been the trend in South Africa's GDP of late, the Agricultural sector is the major contributor to South Africa's economic growth at this time, with seasonally adjusted constant prices annualised growth in Agriculture sitting at 44.2% for the third quarter of 2017.

the thirteen colonies are:

connecticut, delaware, georgia, maryland, massachusetts, new jersey, new york, new hampshire, north carolina, pennsylvania, rhode island, south carolina, virginia