What is the name of the movie about the U.S. attack on Hiroshima and Nagasaki, Japan?

It's called "Hiroshima Mon Amour"

"Hiroshima Mon Amour" is a love movie directed by Alain Resnais and starring Emmanuelle Riva, Eiji Okada, etc. . The film was released in France on June 10, 1959. The film tells the love story between a French actress and a Japanese architect.

Plot summary——

An actress from the United States (played by Emmanuelle Riva) went to Hiroshima, Japan to shoot a film promoting peace, and met a Japanese architect. (played by Eiji Okada), the two quickly fell in love. Later, her lover was killed, and her emotions also passed away with her dead love. While she told her story, the real forgetfulness began.

Just after women's love was destroyed, Hiroshima was also destroyed by the atomic bomb. The entire city was reduced to ruins, and the spirit and lives of the people of Hiroshima were greatly devastated. But more than ten years later, the woman saw in Hiroshima that people could only rely on the relics of the war preserved in museums to recall that tragic history, but they themselves had gradually forgotten it.

Character introduction——

1. Elle actor? Emmanuelle Riva

An American actress. When he went to Japan to shoot a movie, he met a Japanese architect and quickly fell in love with him. She thought she could bury the pain of her first love and broken love forever, but her rapidly growing relationship with a Japanese man opened the door to memory. The entanglement of two love affairs confused her.

2. Lui actor? Eiji Okada

A Japanese architect. He had an extramarital affair with a French actress. When he and Elle went to visit a museum, Elle was reminded of her first love 14 years ago. When they were about to part ways at the end, Lui tried his best to persuade Elle to leave her in Hiroshima, but Elle left after all.