Which English botanist became famous for his research during expeditions to the east coast of Canada in 1766, the Pacific in 1769 and Iceland in 1772?
Which abolitionist was hung in 1859 for his role in the Harper's Ferry Raid and played a major role in starting the Civil War?
31 March, the birthday of César Chávez, is recognised as a holiday in the US states of California, Texas, Arizona and Colorado. What role did he play in the history of the USA?
