GD Birla inherited the family business and moved to further diversify them into other areas. Of these, at least three contemporary family business groups existing in India today can trace their ancestry to him. Of these businesses, he wanted to turn the moneylending business into manufacturing. So he left for Calcutta in Bengal Presidency, the world's largest jute producing region. There, he began "ndependently as a jute broker". In 1918, he established Birla Jute Mills, much to the consternation of established European merchants, whom the biased policies of the British government favoured other than the local Bengali merchants. He had to scale a number of obstacles as the British and Scottish merchants tried to shut his business by unethical and monopolistic methods, but he was able to persevere. When World War I resulted in supply problems throughout the British Empire, Birla's business skyrocketed.