Punjabi homeland formed a province of British India, though a number of small princely states retained local rulers who recognized British authority. The Punjab with its rich farmlands became one of the most important colonial assets. Lahore was a noted center of learning and culture, and Rawalpindi became an important military installation. Most Punjabis supported the British during World War I, providing men and resources to the war effort even though the Punjab remained a source of anti colonial activities. Disturbances in the region increased as the war continued. At the end of the war, high casualty rates, heavy taxation, inflation, and a widespread influenza epidemic disrupted Punjabi society. In 1919 a British officer ordered his troops to fire on a crowd of demonstrators, mostly Sikhs in Amritsar. The Jallianwala massacre fueled the indian independence movement. Nationalists declared the independence of India from Lahore in 1930 but were quickly suppressed. When the Second World War broke out, nationalism in British India had already divided into religious movements. Many Sikhs and other minorities supported the Hindus, who promised a secular multicultural and multireligious society, and Muslim leaders in Lahore passed a resolution to work for a Muslim Pakistan, making the Punjab region a center of growing conflict between Indian and Pakistani nationalists. At the end of the war, the British granted separate independence to India and Pakistan, setting off massive communal violence as Muslims fled to Pakistan and Hindu and Sikh Punjabis fled east to India. The British Raj had major political, cultural, philosophical, and literary consequences in the Punjab, including the establishment of a new system of education. During the independence movement, many Punjabis played a significant role, including Madan Lal Dhingra, Sukhdev Thapar, Ajit Singh Sandhu, Bhagat Singh, Udham Singh, Kartar Singh Sarabha, Bhai Parmanand, Choudhry Rahmat Ali, and Lala Lajpat Rai. At the time of partition in 1947, the province was split into East and West Punjab. East Punjab (48%) became part of India, while West Punjab (52%) became part of Pakistan. The Punjab bore the brunt of the civil unrest following partition, with casualties estimated to be in the millions. Another major consequence of partition was the sudden shift towards religious homogeneity occurred in all districts across Punjab owing to the new international border that cut through the province. This rapid demographic shift was primarily due to wide scale migration but also caused by large-scale religious cleansing