Neo-Piagetian theory: In psychology, the term "Neo-Piagetian theory" is described as a phenomenon that is more or less similar to that of the Jean Piaget's "cognitive development theory" which states the different stages through a child develops thinking and reasoning skills. Jean Piaget theory possesses "stage-like processes".
The neo-Piagetian theory states that the "cognitive development" of a child happens in different "stairstep-like" stages. Though the theory of Neo-Piagetian supported Jean Piaget theory to some extent at the same time it criticized his theory.
In the question above, the given statement signifies the "neo-Piagetian theory".
The Low country of South Carolina tends to oppose independence from Great Britain in the years before the American Revolution because they suffered a lot as a result of the Mercantilist policies initiated by Great Britain. This policy of Great Britain offered subsidies and marketplace to South Carolina.