Jefferson didn't "make" land. He bought the Louisiana Purchase from France.
Thomas Jefferson
It was when the French sold Land to President Jefferson
President Jefferson had sent them out to explore the land.
president Jefferson send Lewis and Clark on an expedition to the west because president Jefferson wanted to learn as much as he can he could about the land (Louisiana) he bought.
a slave breeding farm
Washington and Jackson did a lot of land speculation. Maybe Jefferson and others as well.
the Constitution never said that the president has authority to make land purchases
The land you seek was the Louisiana Purchase
Napoleon. He needed the money to fund his war shenanigans so he sold all his uncolonized land in North America to Thomas Jefferson.
Polk
President Jackson was elected the 3rd president. Thomas Jefferson was not just a president but an inventor as well. The first thing Jefferson did was lowered the taxes and reduced the size of the army. He bought the French's land of Louisiana so the french had money to fight great Britian. This land that Thomas Jefferson bought is called the Louisiana Purchase. The US started by adding 530 acres.