<human>:  With regards to the British political movement Chartism, what was the main demand of Chartists?
<bot>: The main demand of the Chartists was universal male suffrage. The Chartists were a political movement in Britain that began in 1838, and was named after a petition presented to Parliament in 1838. It was the first mass political movement in Britain since the 17th century, and the first to challenge the power of the British aristocracy.