Question: Were both Ben Okri and Katherine Anne Porter Nigerian?

Context articles: Katherine Anne Porter House
The New York Times Fiction Best Sellers of 1962
The Collected Essays and Occasional Writings of Katherine Anne Porter
The Old Order: Stories of the South
Southern Renaissance
Ben Okri
The Jilting of Granny Weatherall
The Collected Stories of Katherine Anne Porter
Katherine Anne Porter
Jane Vandenburgh

The Katherine Anne Porter House is a historic house located in Kyle, Texas.
 It was built in 1890 and added to the National Register of Historic Places in 2004.
 The house is the childhood home of writer Katherine Anne Porter.
 It was restored and turned into a short-lived museum at the instigation of Tom Grimes, director of the Texas State University MFA program.
This is a list of adult fiction books that topped "The New York Times" Fiction Best Seller list in 1962.
 Four books topped the list that year, the longest on top being "Ship of Fools" by Katherine Anne Porter, which spent exactly half the year there - from April 29 to November 11, its last week at the top - though it continued in the top 15 best sellers for another 20 weeks. "
Franny and Zooey" by J.D. Salinger started the year at the top of the list carrying over from 1961, where it entered the top spot on October 25.
 In all Salinger's book spent 25 continuous weeks in the top spot.
 The list was interrupted at the end of the year by the 1962–63 New York City newspaper strike which lasted 114 days and had a profound impact on the newspaper industry in New York.
The Collected Essays and Occasional Writings of Katherine Anne Porter
The Old Order: Stories of the South is a collection of short stories and novels by Pulitzer Prize winning American author Katherine Anne Porter.
 It draws stories from The Leaning Tower and Flowering Judas.
 It also contains Porter's short novel Old Mortality.
 All nine short stories and the novel take place in the American south during the late 1800s and early 1900s (Porter 1955).
 The collection of stories are based largely on Porter's experience of growing up in the American south at that time.
 The collection, in addition to being excellent specimens of writing, offers a social critique of southern society of the time and its negative effects.
 These negative effects include slavery as a destructive influence on the African American race and general racial inequality, social norms hampering the discussion of "unpleasant" topics like death or sex, and the vast inequality of gender roles.
The Southern Renaissance (also known as Southern Renascence) was the reinvigoration of American Southern literature that began in the 1920s and 1930s with the appearance of writers such as William Faulkner, Thomas Wolfe, Caroline Gordon, Elizabeth Madox Roberts, Katherine Anne Porter, Allen Tate, Tennessee Williams, Robert Penn Warren, and Zora Neale Hurston, among others.
Ben Okri OBE FRSL (born 15 March 1959) is a Nigerian poet and novelist.
 Okri is considered one of the foremost African authors in the post-modern and post-colonial traditions, and has been compared favourably to authors such as Salman Rushdie and Gabriel García Márquez.
The Jilting of Granny Weatherall is a short story written by the American writer Katherine Anne Porter.
 It was published in 1930 as part of Porter’s short story collection, "Flowering Judas, and Other Stories".
The Collected Stories of Katherine Anne Porter is a book by Katherine Anne Porter published by Harcourt in 1965, comprising nineteen "short stories and long stories", as Porter herself would say.
 It won the Pulitzer Prize for Fiction and the U.S. National Book Award for Fiction.
Katherine Anne Porter (May 15, 1890 – September 18, 1980) was an American journalist, essayist, short story writer, novelist, and political activist.
 Her 1962 novel "Ship of Fools" was the best-selling novel in America that year, but her short stories received much more critical acclaim.
 She is known for her penetrating insight; her work deals with dark themes such as betrayal, death and the origin of human evil.
 In 1990, Recorded Texas Historic Landmark number 2905 was placed in Brown County, Texas, to honor the life and career of Porter.
Jane Vandenburgh (born 1948) is an American novelist and memoirist.
 A fifth-generation Californian, she was born in Berkeley and grew up in Redondo Beach and in the San Fernando Valley.
 She holds a Bachelor's Degree in English Literature from Long Beach State (1971) and a Master's Degree (1978) in English literature with a specialization in creative writing from San Francisco State University.
 The title story of her master's thesis, "The Salisbury Court Reporter", won the Katherine Anne Porter Prize for fiction in 1981.
 Her publisher is Counterpoint Press.