Answer:
it would add more land to the South
it would strengthen Thomas Jefferson and his political party.
Step-by-step explanation:
The Federalists opposed the Louisiana Purchase because they thought it would hurt them politically. They claimed to oppose the Purchase because it was unconstitutional but they really opposed it because they thought that the states that would be made out of the Purchase would be more Democratic-Republican than Federalist.
In general, the Federalists were an elite party of New England merchants. They had some support in other states, but almost solely among the upper classes. The Federalists reasoned that the states that were made out of the Purchase would be settled by small farmers, a class that was solidly in favor of Jefferson's party.