Because of the angler destiny
The missionaries in the Oregon Territory had a very different purpose than the rest of those in the area. Most people who went west and to the Oregon Terrritory were doing so to get land and start a farm. Missionaries, while they might have done this as well, were primarily there to spread the Christian Gospel and start Christian ministries such as churches and orphanages.
I believe the answer is: <span>adopted the customs of those people
For example, Roxana, one of his wives, was originated from Iranian Descent. When Alexander decided to court her, he followed traditional Iranian ways to marry a daughter and this granted him a huge amount of respect from local people that help him establish his empire.</span>