Before revision: On 8 May 1971, the largest nationally coordinated walkathon to date saw over 150,000 American walkers on several dozen routes throughout the nation walk over 2 million miles, raising over 1.2m to fight hunger.
After revision: On 8 May 1971, the largest nationally coordinated walkathon up to that time saw over 150,000 American walkers on several dozen routes throughout the nation walk over 2 million miles, raising over 1.2m to fight hunger.