It's really about trading routes. Today different regions of the world specialize in different industries. You get competition between people vying in the sam

It's really about trading routes. Today different regions of the world specialize in different industries. You get competition between people vying in the same industry and between trading partners. Communication really doesn't help when it comes to corporate/national power struggles. This is also why so many 'brother' countries tend to fight; Ukraine and Russia, Yeman and Saudi Arabia, Eritrea and Ethiopia.