The first missionaries for the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) were Kimo Pelia and Samuela Manoa from Hawaii. They arrived in 1863 and were there for about 20 years. In 1888, the Samoan Mission was officially established, with several congregations already in operation thanks to the efforts of Elder Pelia and Elder Manoa.
The first missionaries from the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) sent to preach in the islands of the Pacific arrived in 1843. The first mission in Samoa was established in 1888, and over the next 10 years, 11 congregations formed.
As of December 2010, there are 71,000 baptized members of the Church in Samoa and 15,000 in American Samoa. That is about 40% of the population in Samoa and 22% of the population in American Samoa. These numbers don't take into accout Samoans that do not live in Samoa...
Missionaries for the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" church) first arrived in American Samoa in 1843. They set up a mission headquarters near Apia. The first official congregation in Samoa was set up in Pago Pago in 1893. Within the next decade, over 11 more congregations were created. As school was created in 1903 near Mapusaga. The first Relief Society was created here in 1906, and a Primary in 1908. You can read more about the history and current news of the Church of Jesus Christ of Latter-day Saints in American Samoa at the "Related Links" below.
The first Mormon missionaries arrived in Samoa in 1863.
Idaho, most of Utah, much of Tonga - especially the large island of Vavau, Samoa Very large percentages among the populations of these areas are Members of the Church of Jesus Christ of Latter-day Saints
Christian Congregational Church of Samoa was created in 1839.
By trade
The country with the highest percentage of members of the Church of Jesus Christ of Latter Day Saints (commonly called "Mormons") in it's population is Samoa. The largest percentage of Church members reside in the United States. (approximately 40% of Church members live in the U.S.) Other than that, the Church is reasonably common in most western nations, including Canada, the United States, the Pacific Islands, Central and South America, Mexico, and many European nations. Congregations exist in almost every nation of the world.
Members of the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" church) can be found in nearly every nation of the world. To see how the membership of the Church is distributed worldwide, visit the "Related Link" below for an interactive map. Please note that this map goes by citizenship, not actual location... for example, there ARE Mormon congregations in mainland China, but they are only attended by expatriates (citizens of other nations - mostly U.S., Australian, and Taiwanese businessmen) - the Chinese government does not allow Chinese citizens to practice Mormonism in China.
Methodist church
The first Catholic Church in American Samoa was St. Joseph's Church, established in 1845. It was founded by French Catholic missionaries from the Society of Mary (Marists), who played a crucial role in the development of the Catholic faith in the region. The church served as a central place of worship and community for the local population, marking the beginning of Catholicism's influence in American Samoa.
I couldn't find any specific information about the future Apostle Chairman of the AOG Church of Samoa. It would be best to reach out to the church directly for the most up-to-date information.