Question: What country of origin does Edgar G. Ulmer and The Black Cat have in common?

Context articles: The Man from Planet X
The Black Cat (1934 film)
Moon Over Harlem
Edgar G. Ulmer
The Daughter of Dr. Jekyll
Thunder Over Texas
Her Sister's Secret
Green Fields (film)
The Wife of Monte Cristo
Beyond the Time Barrier

The Man from Planet X is a 1951 American science fiction horror film starring Robert Clarke, Margaret Field and William Schallert.
 It was directed by Edgar G. Ulmer.
The Black Cat is a 1934 American Pre-Code horror film directed by Edgar G. Ulmer and starring Béla Lugosi and Boris Karloff.
 The picture was the first of eight movies (six of which were produced by Universal) to pair the two iconic actors.
 It became Universal Pictures' biggest box office hit of the year, and was also notable for being one of the first movies with an almost continuous music score.
 Lugosi also appeared in the 1941 film with the same title.
Moon Over Harlem is a 1939 American race film directed by Edgar G. Ulmer.
Edgar Georg Ulmer () (September 17, 1904 – September 30, 1972) was a Jewish-Moravian, Austrian-American film director who mainly worked on Hollywood B movies and other low-budget productions.
 His stylish and eccentric works came to be appreciated by auteur theory-espousing film critics over the years following his retirement.
 Ulmer's most cherished productions are the bizarre Universal Horror film "The Black Cat" (1934) and the seminal film noir "Detour" (1945).
 Most of his other films remain rather obscure.
The Daughter of Dr. Jekyll is a low-budget 1957 horror film directed by Edgar G. Ulmer and released by Allied Artists.
 It was released in theaters in 1957 on a double bill with "The Cyclops".
Thunder Over Texas is a 1934 American populist contemporary western film directed by Edgar G. Ulmer under the alias Joen Warner (the name of Ulmer's previous wife) and produced by two nephews of Universal Pictures head Carl Laemmle, Arthur and Max Alexander's Poverty Row Beacon Productions.
 The film's story was written by Shirley Ulmer under the name of Sherle Castle.
 Shirley was then married to Max Alexander but would soon leave Max to marry Edgar with the result that Lammele blacklisted Ulmer from Hollywood.
 The film was shot in Kernville, California.
Her Sister's Secret is a 1946 drama film directed by Edgar G. Ulmer and starring Nancy Coleman, Margaret Lindsay, Phillip Reed, and Regis Toomey.
 The film centers around a woman who falls in love with a soldier.
 Believing she has been abandoned, she gives her baby to her married sister.
 The picture was produced and distributed by Producers Releasing Corporation.
 The screenplay was by Anne Green from the novel "Dark Angel" by Gina Kaus.
Green Fields (Yiddish: גרינע פעלדער‎ , trans.
 "Grine Felder") is a 1937 American comedy-drama Yiddish film directed by Edgar G. Ulmer and Jacob Ben-Ami.
The Wife of Monte Cristo is a 1946 American adventure film directed by Edgar G. Ulmer starring John Loder and Lenore Aubert.
Beyond the Time Barrier is a 1960 American Cold War-era black and white time travel science fiction film filmed in Texas in ten days.
 It starred and was produced by Robert Clarke and directed by Edgar G. Ulmer.
 Ulmer's wife Shirley acted as a script editor while their daughter Arianne Arden appeared as a Russian pilot.