with that of Punjab, and Sikhs are easily recognised by their distinctive turban (Dastar). Punjab has been called India's melting pot, due to the confluence of invading cultures from the rivers from which the region gets its name. Sikh culture is therefore a synthesis of cultures. Sikhism has forged a unique architecture, which S. S. Bhatti described as "inspired by Guru Nanak's creative mysticism" and "is a mute harbinger of holistic humanism based on pragmatic spirituality". The American non-profit organization United Sikhs has fought to have Sikh included on the U.S. census as well, arguing that Sikhs "self-identify as an ethnic minority" and believe "that they are more than just a religion". During the Mughal and Afghan persecution of the Sikhs during the 17th and 18th centuries, the latter were concerned with preserving their religion and gave little thought to art and culture. With the rise of Ranjit Singh and the Sikh Raj in Lahore and Delhi, there was a change in the landscape of art and culture in Punjab; Hindus and Sikhs could build decorated shrines without the fear of destruction or looting. The Sikh Confederacy was the catalyst for a uniquely Sikh form of expression, with Ranjit Singh commissioning forts, palaces, bungas (residential places), and colleges in a Sikh style. Sikh architecture is characterised by gilded fluted domes, cupolas, kiosks, stone lanterns, ornate balusters, and square roofs. A pinnacle of Sikh style is Harmandir Sahib (also known as the Golden Temple) in Amritsar. Sikh culture is influenced by militaristic motifs (with the Khanda the most obvious), and most Sikh artifacts—except for the relics of the Gurus—have a military theme. This theme is evident in the Sikh festivals of Hola Mohalla and Vaisakhi, which feature marching and displays of valor. Although the art and culture of the Sikh diaspora have merged with that of other Indo-immigrant groups into categories like "British Asian", "Indo-Canadian" and "Desi-Culture", a minor cultural phenomenon that can be described as "political Sikh" has arisen. The art of diaspora Sikhs like Amarjeet Kaur Nandhra, and Amrit and Rabindra Kaur Singh (The Singh Twins) is influenced by their Sikhism and current affairs in Punjab. Bhangra and Giddha are two forms of Punjabi folk dancing which have been adapted and pioneered by Sikhs. Punjabi Sikhs have championed these forms of expression worldwide, resulting in Sikh culture becoming linked to Bhangra (although "Bhangra is not a Sikh institution but