Globalization
Because there were different cultures and ideas set on different regions of the world in the first place, the forms of living among various countries could be clearly distinct even when considering environmental and other outside effects on people. Otherwise, every single country in the world would have a single way of living i.e. Western ways of living, thinking, understanding and interpreting. It can't be just said that the Western cultures rule all over the world, which is not true, whereas those might have bigger impact than some other minor cultures seemingly and practically. As Western cultures took hegemonic position, western countries have more authority, control and impact on the lifestyles of people, however, it doesn't mean that other countries live without having their own roots and origin of cultures. I agree with the idea that Western cultures would take their dominant position for long, but do not agree with that they will always dominate. It would take long time to move a power from one culture to another that involves all other complicate interactions, however. Considering the history that repeats again and again, it was not the western culture that rule the entire world since the beginning, sometime in the past; there was another hegemonic power, Mongol dynasty which owned the largest territory in the entire human history spreading over the Asia and Europe and powerful influence back in 13th century. And who knows what culture takes the next dominant position?