Prince Archie heard with British accent in Meghan Markle family video

Meghan Markle shared a video from the UK of Prince Archie, 7, shouting "Go, go!" while racing Princess Lilibet, 5, on her bike down a track. Archie sounded distinctly British, though usually heard with a pronounced American accent. Prince Harry is heard calling "Archie, Archie" in the background.