Question: How did the US acquire the lands according to James Loewen?
About the article "Louisiana Purchase", section "Nature of sale".

Candidate passages:
Loewen moved with his wife to be with his sons, Charles Bernard Loewen and John Falkland Loewen, and retired at The Boyne River Mill near to Mansfield.
He was the author of a book entitled "Fly fishing flies". 
Loewen co-authored a United States history textbook, "" (1974), which won the Lillian Smith Award for Best Southern Nonfiction in 1975.
The Mississippi Textbook Purchasing Board did not approve the textbook for use in the state school system.
Loewen challenged the state's decision in a lawsuit, "Loewen v. Turnipseed" (1980).
The American Library Association considers "Loewen v. Turnipseed", 488 F. Supp.
1138 (N.D. Miss.
1980), a historic First Amendment case and one of the foundations of the "right to read freely."
"Mississippi: Conflict and Change" was rejected for use in Mississippi's public schools by the Mississippi Textbook Purchasing Board on the grounds that it was too controversial and placed too much focus on racial matters.
Judge Orma R. Smith of the U.S. District Court ruled that the rejection of the textbook was not based on "justifiable grounds", and that the authors were denied their right to free speech and press. 
The historian James Loewen is among those who assert that the United States purchased only France's claim to the Louisiana Territory, as the land belonged to the tribes who inhabited the area.
In his view, the US acquired the lands slowly throughout the nineteenth century by purchases from individual Native American tribes and by wars against them.
The question is discussed at length in the article on Aboriginal title in the United States, as well as in articles on the American Indian Wars and the U.S. Supreme Court case "Johnson v. M'Intosh".
Lies Across America a 1999 book by James Loewen, and is a follow up sequel to his 1995 work "Lies My Teacher Told Me".
The book focuses on historical markers and museums across the United States.
The book starts on the West Coast and moves east, a deliberate break from the traditional history found in textbooks, which begin with the Pilgrims and move westward.
Similarly, Loewen covers Hispanic rather than English discovery, and American Indian history.
Loewen's book voices two major complaints about historical markers in the United States.
The first, and most major, deals with historical markers established in the Southern United States which attempt to white-wash the history of slavery and the period of Reconstruction.
Many of these markers were established between 1890 and 1920, the nadir of American race relations.
Most were placed by organizations with pro-Confederate agendas and reflect the racism of the early 20th century.
While some markers have been altered in the last forty years as a result of civil rights progress, many have not—especially those extant at American Civil War battle sites and in the South.
Loewen's second major complaint deals with the treatment of Native Americans, who are often neglected and omitted in the telling of United States history.
The author challenges and corrects many of the inaccurate and Eurocentric mistruths spread by story markers across America.
At the end of his book, Loewen makes suggestions for how those concerned about the misrepresentation of history can change markers and monuments to convey historical truth and accuracy.
The organizations running historical sites are faulted in Loewen's book according to Wilton Corkern.
In the book, Loewen argues every historic site is "a tale of two eras": the one from when the event happened and the one from when the event was commemorated. 
Loewen was born in Decatur, Illinois, to Winifred and David F. Loewen, on February 6, 1942.
His mother was a librarian and teacher, and his father was a medical director and doctor.
Loewen grew up in Decatur, Illinois.
He was a National Merit Scholar as a graduate in 1960 from MacArthur High School.
Loewen attended Carleton College.
In 1963, as a junior, he spent a semester in Mississippi, an experience in a different culture that led to his questioning what he had been taught about United States history.
He was intrigued by learning about the unique place of nineteenth-century Chinese immigrants and their descendants in Mississippi culture, commonly thought of as biracial.
Loewen went on to earn a PhD in sociology from Harvard University based on his research on Chinese Americans in Mississippi.