Well, to get a full picture of what has happened I think you need to study basic major events of world's history beginning from the fourth millennium BC, when human civilizations have appeared. Because, as others have mentioned, when you study something in history it can be quite useful to recall the previous parts as it helps to understand why the things are what they are.

World War II.

It accelerated the development of science and technology.

Two inventions were of particular influence on the course of history:
1. The invention of the Atom Bomb which directly led to the Cold War (and hot wars such as the Vietnam War).

2. The invention of the Bombe, which was the forerunner of the modern day computer (a proof of concept or prototype if you will).

Modern history and the modern world would be unrecognizable without these two inventions.

But how do you explain the causes for WWII, without explaining the political and economic turmoil in Germany and Europe in general?

You would have to go back to the Treaty of Versaille.

And how would you explain the Treaty of Versaille without covering WWI?

And how would you explain the causes for WWI, without exploring the political and economic state of Europe prior to WWI?

And so on....

good question

The War & Peace" for a modern setting of sorts. The end of WW2, and discussing all-important major events of the cold war, from major characters, original characters, and the young versions of soon-to-be major characters who rose to prominence in the 21st century. With current issues in politics from eastern Europe and southeast Asia today.

I will probably write about the COVID-19 :P

I want to write about the Korean War.

I would write about colombian civil war, it will help people to understand this actual situation

I always found pretty interesting Tolstoys book, but never found the will nor the time to start reading it, I mean, I don't even own the book.

I would write about the religion and culture development, to understand what next is coming.

Roman Empire