It's important to note that:
* Anastasia's native language was Russian. She would have spoken with a Russian accent.
* She was a member of the Russian Imperial family and lived in Russia her entire life. She wouldn't have had any exposure to American English or Bostonian accents.
* The idea of a Russian royal speaking with a Bostonian accent is a fictional trope, likely inspired by popular culture.
It's essential to separate fact from fiction when discussing historical figures. While Anastasia's story has been the subject of numerous books and films, it's crucial to rely on credible historical sources and not fictional portrayals.