To determine which event occurred last among the options provided, here are the chronological order of the events:
- Cornwallis’s capture of Charleston - This occurred in May 1780.
- The Battle of Cowpens - This battle took place on January 17, 1781.
- The battle at Guilford Courthouse - This battle was fought on March 15, 1781.
- The surrender of Cornwallis at Yorktown - This surrender occurred on October 19, 1781.
Based on this chronology, the event that occurred last is the surrender of Cornwallis at Yorktown.