What was the name of the boundary created by the piece of legislation that led to the reason for the Pakistan Independence Day?
Independence Day (Pakistan): Independence Day (Urdu: ‎ ; "Yaum-e Āzādī"), observed annually on 14 August, is a national holiday in Pakistan. Independence Day (Pakistan):  It commemorates the day when Pakistan achieved independence and was declared a sovereign nation following the end of the British Raj in 1947. Independence Day (Pakistan):  The event was brought forth by the Indian Independence Act 1947 under which the British Raj gave independence to the Dominion of Pakistan which comprised West Pakistan (present-day Pakistan) and East Pakistan (now Bangladesh). Partition of India: The Partition of India was the division of British India in 1947 which accompanied the creation of two independent dominions, India and Pakistan. Partition of India:  The boundary demarcating India and Pakistan became known as the Radcliffe Line.
the Radcliffe Line