Most people were outraged when Jefferson bought Louisiana because of money and loyalty issues.
Even a lot of Republicans, like Jefferson himself, were angry when they found out that Jefferson was going to buy Louisiana.
They thought it was too much money that they did not have for too much land they already had.
If this purchase was to be confirmed, then it would add 13 million dollars to the US national debt. However, Jefferson knew that it would only take fifteen years to pay off.
The Republicans thought it was too much money for the land.
The Federalists did not want the purchase even more than the Republicans.
Also, the Federalists had an even bigger objection against Louisiana.
They were loyal to Britain, so when Jefferson wanted to buy Louisiana they were furious. They wanted to re-conciliate with Britain, but buying Louisiana meant that was not going to happen.
Having Louisiana as part of America would make them stronger, almost as strong as other foreign superpowers.