<Tr> <Th> President </Th> <Th> School (s) </Th> <Th> Graduation year </Th> </Tr> <Tr> <Td> John Adams </Td> <Td> Harvard University </Td> <Td> 1755 </Td> </Tr> <Tr> <Td> James Madison </Td> <Td> Princeton University </Td> <Td> 1771 </Td> </Tr> <Tr> <Td> John Quincy Adams </Td> <Td> Harvard University </Td> <Td> 1787 </Td> </Tr>

Why is university of pennsylvania an ivy league school