In the second half of the twentieth century the UK moved from being a virtually 'all white' Christian society to a multi-ethnic, multireligion, multicultural society. At the start of the 1960s only 0.25% of the total population of the UK were from the Indian subcontinent or Afro-Caribbean in origin. 'Asians' became the general term for describing primary and secondary immigrants from the Indian subcontinent. In the USA, however, 'Asians' were immigrants from South East Asia, particularly Vietnam, Cambodia and the Philippines. The genetic mixing of indigenous groups and foreigners started in prehistoric times and continues to the present day. The Muslim empire strengthened under the leadership of tolerant Moghuls like Humayun, Akbar, Jehangir and Shah Jahan but its decline started in the late 17th century in the reign of Emperor Aurangzaib. Legislation to abolish slavery was passed and within a year another law was enforced which prevented landings of slaves in British colonies.