Q: Yes / no, is the following a verifiable fact?
"Junk ships are thought to have been some of the first Asian ships to come to the American west coast."
Chain-of-thought:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Many Chinese Immigrants came on one way trips with Junk (ship) ships, there remains and ruins can be found buried underneath California beaches. The answer: yes.