Humanity has gone to war several times through history to defend themselves against invaders and oppressors. But in the future, the wars would be waged against different threats and factions with different agendas.
1. Rich vs. Poor
The US currently has a population of 313 million. Of these, the 400 wealthiest people command the same kind of wealth as the 150 million poorest people in the country, i.e., half the entire population. When citizens in the world’s most powerful economy stand up against this income disparity, they might just ignite a war that could engulf the entire world.
2. Minorities vs. majorities
In the US alone, Hispanics, Asian and African-American minorities are expected to overtake the country’s population as majorities instead of the current white majority. Since the white majority has tormented minority races so much, there is a fair chance that when other races acquire majority, it won’t sit well with white population causing strife.
3. Local workers vs. workers overseas
The battle between local workers and workers overseas is already underway. As unemployment figures soar in the first world due to bad economic policies of their governments, tension between local workers and the overseas workers they lose their jobs to will only rise. Over a period of time, the tension may even cause political tension between countries as countries where jobs have been outsourced would try to hold on to them and nations bleeding jobs would try to retain them.
4. The battle for cultural monopoly
At the moment, the US commands something of a monopoly over world culture through its brand names (McDonald’s, Coca Cola, Subway, Levi’s, etc.) and pop culture exports. However, as local cultural powerhouses gain prominence, we might American and west-centric cultural icons being challenged and replaced by others. Such a conflict is more likely to occur in the form of market control and control over revenue.
5. The battle for the environment
In the future, the emissions and pollution caused by one particular class of people or country might impact another so badly that it might result in serious conflicts. Nations that depend heavily on nature especially those that rely on tourism or seafood and those with limited freshwater may find it hard to get by when their natural resources are polluted.