Question: Are both Robin McKinley and Anita Diamant American authors?

Context paragraphs:
Chalice (novel): Chalice is a novel by American fantasy author Robin McKinley.  It was published in 2008 (New York: G. P. Putnam's Sons).

The Red Tent (Anita Diamant novel): The Red Tent is a novel by Anita Diamant, published in 1997 by Wyatt Books for St. Martin's Press.  It is a first-person narrative that tells the story of Dinah, daughter of Jacob and sister of Joseph.  She is a minor character in the Bible, but the author has broadened her story.  The book's title refers to the tent in which women of Jacob's tribe must, according to the ancient law, take refuge while menstruating or giving birth, and in which they find mutual support and encouragement from their mothers, sisters and aunts.

The Red Tent (miniseries): The Red Tent is an American television miniseries produced by Paula Weinstein and directed by Roger Young.  The first two-hour episode premiered on Lifetime on December 7, 2014; the second and final episode aired the next day.  The series is based on the best-selling novel of the same name by Anita Diamant.

The Blue Sword: The Blue Sword is a fantasy novel written by American author Robin McKinley and published by Greenwillow Books in 1982.  The novel "The Hero and the Crown" serves as a prequel.  "The Blue Sword" has received several awards, including: Newbery Honor Award, ALA Best Book for Young Adults and the ALA Notable Children's Book.  The story, told in the third-person omniscient perspective, is of a young woman named Angharad Crewe, called Harry, who becomes a warrior in her adopted homeland of Damar.

Robin McKinley: Jennifer Carolyn Robin McKinley (born November 16, 1952), known as Robin McKinley, is an American author of fantasy and children's books.  Her 1984 novel "The Hero and the Crown" won the Newbery Medal as the year's best new American children's book.

Rose Daughter: Rose Daughter is a retelling of the fairytale "Beauty and the Beast" by Robin McKinley, published in 1997.  It is the second retelling of the tale that McKinley has written: the first being her 1978 story, Beauty: A Retelling of the Story of Beauty & the Beast.

Anita Diamant: Anita Diamant (born June 27, 1951) is an American author of fiction and non-fiction books.  She has published five novels, the most recent of which is "The Boston Girl", a "New York Times" best seller.  She is best known for her 1997 novel "The Red Tent", which eventually became a best seller and book club favorite.  She has also written six guides to contemporary Jewish practice, including "The New Jewish Wedding," "Living a Jewish Life," and "The New Jewish Baby Book", as well as a collection of personal essays, "Pitching My Tent".

Alfred Diamant: Alfred Diamant (September 25, 1917 – May 11, 2012) was an American political scientist.  His main contribution was in the field of comparative politics and comparative public administration.  He was a member of the Comparative Administration Group (CAG) and a co-chairperson of the Council for European Studies based at Columbia University.  According to Peter Alexis Gourevitch, Diamant was both “on the Executive Committee of the Council for European Studies (based in New York) and the Interuniversity Center for European Studies in Montreal.”  Alfred Diamant was published by Princeton University Press and by top ranking journals like Administrative Science Quarterly, Comparative Political Studies, and PS.  Political Science and Politics.  (See List of publications) Diamant’s “areas of expertise” were “Comparative Western European Politics and Social Policy.”  Together with his colleague, James Christoph, he “established Indiana University as a major site of the study of European culture, society and politics.”  John D.Martz called the “works of Maurice Duvergier, Sigmund Neumann and Alfred Diamant” that focus on the study of political parties “Western European-oriented classics.”  D.B. Robertson saw Alfred Diamant as “a gifted and humane scholar.”

The Outlaws of Sherwood: The Outlaws of Sherwood is a retelling of the legend of Robin Hood by Robin McKinley.  In McKinley's afterword, she says, "The retellings through the centuries have echoed concurrent preoccupations."  The story includes both the traditional Robin Hood characters — Little John, Much, Friar Tuck, Marian and Alan-a-dale — and characters of McKinley's own invention.  Notably, three of the most important characters are women, all of whom escape marriage to prospective spouses chosen by their fathers.

A Knot in the Grain and Other Stories: A Knot in the Grain and other Stories is a collection of short fantasy stories by author and Newbery Medalist, Robin McKinley.  Published by HarperTrophy, this collection of stories came out in 1994 although several of the stories had been previously printed.  This collection gives readers a taste of McKinley's style and allows brief glimpses in the worlds where magic lives and you never know what might be possible.

Supporting paragraphs: Robin McKinley Anita Diamant
Answer: yes