Indeed, the famous port city of Nagasaki served as Japan's sole point of contact with the outside world during 260 years of self-imposed isolation.
During Nagasaki's 260 years of self-imposed isolation, the port city became the sole point of contact with the outside world.
mnli hypothesis: During Nagasaki's 260 years of self-imposed isolation, the port city became the sole point of contact with the outside world. premise: Indeed, the famous port city of Nagasaki served as Japan's sole point of contact with the outside world during 260 years of self-imposed isolation.