Starting in the 15th Century, Colonialism is evident, thanks to Christopher Columbus's discovery of America, encouraging everyone in Europe either to be conquistadors or pirates, which encourages every fiction in the world to be based from those themes.
I would not limit those themes in just sea warfare but also in land, namely some Eurasian wars of conquest by any empire that time. But what effect would it be if colonialism on a larger scale would persist even here in the 21st century? Of course, America wouldn't have existed as we know today, Serbia is still making an uprising against the Turks(of course!), France woulf still have Quebec, Spain would not have Mexico or Philippines independent, Britain would stil dominate the world map and uh, China, Russia and Japan would remain a moderate power.
Of course, you will colonize a land baceause of its geopolitical strategic interest like food, oil, population transfer, military stations and others. Without these factors, you will just colonize a land for nothing.
There are other non economical factors like spreading religion, Spain, France and Britain did it while Russia was on a smale scale.
With these explanations, now people would see why there is a term called colonization.



