Rubber
In the 1800s, most sap to make rubber came from South America. In 1876, Henry Wickham got seeds from rubber trees in Brazil, and took them to Kew Gardens, England, and sent them to Ceylon (Sri Lanka), Indonesia, Singapore and British Malaya. Later, Malaya (now Malaysia) made the most rubber. People tried to grow rubber in India, in year 1873 at the Botanical Gardens, Kolkata. The first Hevea farms in India were made at Thattekadu in Kerala in 1902. The Congo Free State in Africa also grew a lot trees for rubber at the start of the 20th century, and most of the people who worked on those farms were forced labor. Liberia and Nigeria also started growing trees to make rubber.