If neither a sitting president nor vice president is seeking their party's nomination, the nomination is said to be

Open nomination

An open nomination is one whereby neither the sitting president or vice president is seeking nomination to be a party’s presidential candidate. An example of such a situation was in 2008 and in 1952 whereby neither the sitting president were seeking the nomination

the economic difference between the three colonial regions. shipbuilding, whaling, fishing, and trapping where also main factors to the economy. the southern regional colonies economy was based on sugarcane, rice, cotton, tobacco, and indigo.