That was completely understandable, Lemi! I think, if I get you to write and read even more, your English will quickly become perfect!
(not sure, if reading my texts will get you there, though!?)
You're describing a part of how the machinery gets people to join a cause. There's no natural reason for poverty, especially looking at our technical understanding of nature, how we can tame even a dramatic crisis, if we take advantage of our powers. War does not originate from people themselves. It doesn't take a lot of people for any two groups to realize that it is insane to kill each other and it wouldn't end with the dominance of one group over another, but with a solution for existence of both or even the joining into one group. We are no longer animals, despite what media tries to convey. In the universe we represent the next layer above reactive intelligence and don't have to submit to the rule of the jungle anymore.
However, we have a weakness that applies to all of life, but we human beings are on the cusp of overcoming it with the power of our mind: Life ticks by the forces of fear and desire. It does so from the beating of our heart to the breathing into our lungs, to hunger, to clothing, to housing and so on. The very root of being a life depends on us wanting another heartbeat, fearing to miss the next, wanting air and fearing not to have enough again, desire food and fearing to starve...this is how the pendulum of life keeps swinging.
But with all the basics generally covered, our focus goes to the higher measures of this pendulum's swinging. The worst may be the desire to having something non-essential and the fear not to have it, going backward would be followed by the desire to be respected and the fear to be ridiculed and the crossroads may be the desire to be useful and the fear to be not. All these aspects appear to us as essential as our heartbeat the more we lose touch of those basics. When our entire focus is on these outer reaches of this pendulum of life, the inner needs eventually start screaming and bad conditions start to appear. It may start with psychological problems, then move on to physical conditions all the way down to our core of life, depending on how strongly we've forgotten about those fundamental desires and fears.
Anyway, the system is designed to use this mechanic of life. It brings our focus to the widest swing of this pendulum, because it knows that it has only limited access to the basic amplitude. Hunger can be controlled, but further down to air and heartbeat it normally can't go. Air has been under attack for a while, though, but that's a different story, haha.
Thus our desires are being raised far out of the range of necessity and equally our fears follow, because that is how it works. You can't fear something without wanting the opposite or want something without fearing the opposite. The question is, which of the two are you using to make your decisions!? The more you make yourself aware of your basic factors that give you life, the more you take charge in making your choice for the less essential notches on that scale of the pendulum. They won't matter as much anymore and those, who try to hijack you by those fears and desires, will lose their power over you gradually.
Just so I mention it, what you've been describing are mostly the makings of a civil war, when a populous recognizes that it must have been treated unfairly and they rise against their own leadership or want to split from the larger group that is being made responsible (aka the fall of the Soviet Union). But a war that has one nation cross an ocean to destroy a totally foreign culture, that's a different story and the means to rouse people to join the cause are partially explained above.
Yes, there is more, certainly. Psychology examines even more bizarre effects we can observe in not just the behavior of a single human, but entire cultures. It's a universal desire to find logic, but in order to find it, it requires order where there can be order. The largest momentum will often take over, simply to sort things out in the pursuit of logic. Sometimes this momentum seemingly comes out of nowhere, but it is the strength of its believers, those, who understand what may well be the next applicable solution, which gives magnitude to such momentum. If it is wrong, it will get smashed, if it keeps us from interacting properly, it will be dispersed, but the speed in which this happens depends heavily on the strength of our understanding. The more people see a solution, the more likely it will win. It's not enough to see the problem, that leads to nothing all by itself. You have to understand where things would have to go in order to improve a situation. See the solution! That is never ever a passive thing, but has to be active, requires activity. That's often the biggest hurdle for us. We often are so fixated on problems that we forget to really carefully examine potential solutions. It's hard work and intense focus that is needed...the readiness to face new challenges.
Ah well...