Plantation owners worked hard to maintain a hierarchical caste system that prevented worker organization, and divided the camps based on ethnic identity. An interesting outcome of this multi-cultural workforce and globalization of plantation workers was the emergence of a common language. Known as Hawaiian Pidgin, this hybrid primarily of Hawaiian, English, Japanese, Chinese, and Portuguese allowed plantation workers to communicate effectively with one another and promoted a transfer of knowledge and traditions among the groups. A comparison of 1959–2005 racial categories shows the ongoing shifts.