19th-century philosophy of complexity from mathematics, astronomy, physics, chemistry, biology, and a new discipline called "sociology", which is the study of the "dynamics and statics of society". The American philosophers Charles Sanders Peirce and William James developed the pragmatist philosophy in the late 19th century. The twilight years of the 19th century in Britain saw the rise of British idealism, a revival of interest in the works of Kant and Hegel. Transcendentalism was rooted in Immanuel Kant's transcendence and German idealism, led by Ralph Waldo Emerson and Henry David Thoreau. The main belief was in an ideal spiritual state that 'transcends' the
David Livingstone nearly his entire Kwena people. In the estimation of Neil Parsons of the University of Botswana, Sechele "did more to propagate Christianity in 19th-century southern Africa than virtually any single European missionary". Although Sechele was a self-proclaimed Christian, many European missionaries disagreed. The Kwena tribe leader kept rainmaking a part of his life as well as polygamy. David Livingstone died in 1873 at the age of 60 in Chief Chitambo's village at Ilala, southeast of Lake Bangweulu, in present-day Zambia, from malaria and internal bleeding due to dysentery. His loyal attendants Chuma and Susi removed his heart and buried it