Final answer:
The smallest segments of believers living in North America are likely the Coptic Orthodox Church and the Assyrian Church of the East, as they have fewer adherents compared to the larger Eastern Orthodox Church.
Step-by-step explanation:
In Christianity, one of the smallest segments of believers living in North America is most likely the Coptic Orthodox Church or the Assyrian Church of the East. These churches have much smaller followings compared to the larger denominations such as the Eastern Orthodox Church, which includes the Greek Orthodox, Russian Orthodox, and Ukrainian Orthodox churches. The Eastern Orthodox Church has several million adherents in America, reflecting its strong presence among populations of Southeastern and Eastern European descent.
By contrast, the Coptic Orthodox Church, while ancient and significant in the context of Christianity's history, has a smaller presence in North America compared to the Eastern Orthodox Church. The Coptic Church is central to Christian believers in Egypt and follows a unique set of liturgical practices. Similarly, the Assyrian Church of the East, also known as the Nestorian Christian Church, with its historical expansion eastward from the Mediterranean region, has relatively few practitioners in North America today. Its presence is strongest among communities in Iraq, Syria, Iran, and to a lesser extent the United States.
The Ethiopian Orthodox Tewahedo Church has a robust and culturally distinct practice rooted in the history and traditions of Ethiopia but its diaspora, while present, is less numerous in North America compared to the populations adhering to the Eastern Orthodox Church. Given the comparable statistics, out of the options presented, the Coptic Orthodox Church and the Assyrian Church of the East likely represent smaller segments of Christian believers in North America.