The Bible is clear that Jehovah does not favor one race above another. Whatever happens in Satan's world is not caused by Jehovah.
Think of the area where you live. Surely there are some people who are wealthy while others are poor. Is that because Jehovah is blessing some and not the others? No! Actually, there are several factors involved: Often people who are hard-workers and honest enjoy more stability than those who are lazy or have vices. But there are also individuals who inherited all their money without doing anything to deserve it. And sometimes even people who are hard-workers suffer poverty due to bad health, crime or other circumstances. Jehovah's blessing has nothing to do with it.
On the other hand, although life conditions are often better in Western countries, life is not easy either. Many Christians in Europe and America have to work very hard just to survive. Immigrants to those areas often discover that things are very different than what they were made to believe.
Jehovah does not bless Christians with wealth. Jesus came from a poor family and had a humble lifestyle. The apostle Paul sometimes suffered "hunger and thirst, frequently without food, in cold and lacking clothing" (2 Corinthians 11:27). Yet no one can say they didn't have Jehovah's blessing. Jehovah doesn't promise us riches, but he promises he will take care of our needs. Many Christians, both in rich and poor countries, can witness how Jehovah always takes care of them.