Final answer:
Provinces' ability to pass laws relating to human rights comes from the adoption of international human rights frameworks like the UDHR, ICCPR, and ICESCR into national legislation, such as South Africa's Bill of Rights and the Human Rights Act 1998 in the UK.
Step-by-step explanation:
The provinces' ability to pass laws relating to human rights was provided for under various international agreements and the legal frameworks of individual countries. After the adoption of the Universal Declaration of Human Rights (UDHR) in 1948, member states of the UN, including South Africa, began to adopt the principles outlined in this and other documents like the International Covenant on Civil and Political Rights (ICCPR) and the International Covenant on Economic, Social and Cultural Rights (ICESCR). Countries have incorporated these principles into their national laws, which in some cases has resulted in comprehensive human rights legislation such as the South African Bill of Rights and the Human Rights Act 1998 in the UK.
These human rights frameworks establish the rights to freedom of religion, family choices, and travel, among others. However, the UDHR itself is not legally binding, putting the onus on nations to bring these principles into their legal systems voluntarily. The importance of these covenants is evident as they make up the International Bill of Human Rights, encouraging countries to respect, protect, and promote human rights through their national legislation.