Corn law : The late 19th century population growth had increased in Britain. As urban centers expanded and industry grew, the demand for agricultural products went up, pushing up food grain prices. Under pressure from landed groups, the govt. restricted the import of corn. This was commonly known as corn law.
It was abolised because:-
1) The industrialists and urban dwellers forced the abolition of corn law.
2) Food could be imported into Britain more cheaply than it could be produced within the country.
3) British agriculture was unable to compete with the imports.