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In page Sikhs:

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Sikh migration from British India began in earnest during the second half of the 19th century, when the British completed their annexation of the Punjab, which led to Sikh migration throughout India and the British Empire. During the Raj, semiskilled Sikh artisans were transported from the Punjab to British East Africa to help build railroads. Sikhs emigrated from India after World War II, most going to the United Kingdom but many also to North America. Some Sikhs who had settled in eastern Africa were expelled by Ugandan dictator Idi Amin in 1972.[1] Economics is a major factor in Sikh migration and significant communities exist in the United Kingdom, the United States, Malaysia, East Africa, Australia, Singapore and Thailand.[citation needed]