WEll, we basically suffer from the same ills from which society suffers. We will start with the fact that in the US our church is still, officially, segregated. Sure there is some blending here and there, but officially there are white conference and Regional[black] conferences. These were started because even though EGW gave instruction to do evangelism aamong the blacks, the white Adventist did not want to worship in the same churches with blacks,a nd sadly they still exist today. This is being discussed in depth in another thread. But we can start there. That is a huge wrinkle right there.
BTW, Welcome, I am a newbie myself!