user: Question: what is the reason for change where the date the successor was seated was July 28, 1876?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Georgia 9th', 'Vacant', 'Rep-elect Garnett McMillan died before taking seat', 'Benjamin H. Hill (D)', 'May 5, 1875']
SQL:

assistant: SELECT "Reason for change" FROM "Table" WHERE "Date successor seated" = 'July 28, 1876';