I asked Google's AI this question, and I'm not satisfied with this answer.

Is there a better one?

Respectfully,

/DDD

---

*During his trip to Europe, Mark Twain wrote letters to the Daily Alta
California (newspaper). How did these letters get back to the American
newspaper?*

*Mark Twain's letters to the Daily Alta California were likely transported
back to the United States by steamship.*

During the 19th century, steamships were the primary means of transatlantic
travel. Twain would have mailed his letters from European ports to a ship's
post office. These letters would then be delivered to the United States,
where they would be forwarded to the Daily Alta California's offices in San
Francisco.

This process, while slower than modern communication methods, was
relatively efficient for the time. Steamships could cross the Atlantic in a
matter of weeks, allowing Twain's letters to reach his readers relatively
quickly.