The groups that would be excluded from this widening of political opportunity would be any group that is denied the right to vote, whether this means they are oppressed or in prison, etc.
The north because its an anti-slavery country
To Jefferson, westward expansion was the key to the nation's health: He believed that a republic depended on an independent, virtuous citizenry for its survival, and that independence and virtue went hand in hand with land ownership, especially the ownership of small farms.