A few years ago, a movie about a major US Supreme Court ruling that allowed interracial marriage called “Loving” received a lot of fanfare. Yet, this quintessential American movie starred an Irish woman, Ruth Negga, and an Australian man, Joel Edgerton, as the Virginia couple. Around that same time, the movie “Selma” received a lot of accolades, but the actor who played MLK was a British man born to native Nigerians, David Oyelowo. The movie “Harriet” about Harriet Tubman starred a British actor Cynthia Erivo. Even a famous cable TV series about crime in Baltimore called “The Wire” co-starred a British actor named Dominic West as an American.

These castings are not unusual. Per an AI search summary “Actors, particularly from the UK, Australia, and Canada, frequently play American roles due to rigorous classical training, high-quality theater backgrounds that emphasize accent mastery, and often lower costs for US producers. Additionally, the sheer volume of American media allows for worldwide exposure, encouraging international talent to master American accents.

Key reasons for this trend, as discussed by experts and Reddit users, include:

Training and Versatility: Foreign actors, especially British ones, often have extensive theater training that emphasizes vocal versatility, making it easier for them to master American accents.

Cost Effectiveness: In many cases, foreign actors may be more cost-effective to hire than established U.S. stars, especially in television.

Depth and Authenticity: Some producers, such as on TV Guide, report that international actors sometimes seem better prepared or bring more depth to complex roles compared to American counterparts.

The ‘Hollywood’ Pull: As the biggest market, Hollywood is the primary destination, and foreign actors are willing to work hard to adapt to American roles to succeed on a global stage.

Accent Adaptability: The neutral, flat nature of many standard American accents can be easier for foreign actors to imitate compared to the complex regional nuances required in many British roles, as suggested by LAist.

Global Appeal: Casting diverse, international talent can help productions appeal to wider, global audiences.

While some debate that American actors are equally capable, the combination of training, cost, and industry competition keeps the demand for foreign actors high in American film and television.”

This is not new with many foreign actors playing Americans. Top of mind, Australians Russell Crowe, Cate Blanchett, Eric Bana and Rachel MacAdams in several movies, Brits Vivien Leigh and Olivia de Havilland in a couple of movies, Scot Sean Connery and Irishman Liam Neeson in a several movies, German-Spaniard Daniel Bruhl in the TV show “The Alienist” and countless Canadians have played Americans.

The above offers a good summary as to the reasons. I think thr primary motivation is dialogue and money. There work back home included more dialogue than in American shows, on average. But, we should not lose sight of cost effectiveness in deploying skilled actors.