system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Colonisation overall was a net positive for the world.

Reasons

1. It created the modern nation state which paved the way for stable borders and is the reason war started to decline. Democracy also started to become commonplace since permanent populations and institutions like school started to become mainstay.

2. *The UK* stabilised warring tribes into democracies.

3. Europe imported the rule of law, *especially the UK* for the first time for just about the rest of the world, people were ruled by laws and not by the strongest tribe or leader. It was also the first time that the law was no longer arbitrary based on which group was in better with the ruling class.

4. They imported the industrial revolution which greatly increased the life expectancy and standard of living.

5. Modern medicine and science we have Europe to thank for *Mostly Germany* which they gave to the rest of the world due to the fact that the whole world now had functioning nations and economies.

6. The continents and islands went from being separate worlds to being one connected world. 

In closing, if Europe had never colonised the world they would be at the space age and the rest of us would be still tribal, warring, and likely very uncivilised. So we should be grateful for them deciding the rest of the world was worth exploring.
gpt
There are two types of colonization, both of which caused problems but one more so than the other.

1. Settlement colonization - Examples here include the United States, New Zealand, and Australia.  The purpose of this type of colonization was to take people from your original country and start building a home for them in the new land.  This is the type that is the cause of virtually every positive that you have listed - though your positives aren't quite accurate. Settlement colonization is the earliest known form of colonization, it was practiced heavily by the Ancient Greeks who would send their pioneers out to Sicily, Turkey, Italy and build new cities.  When practiced in the modern era, it has invariably 100% of the time led to genocide of the existing population in the place you decide is your new home.  The extent of the genocide differs - the Maori in New Zealand weren't slaughtered as thoroughly as the Native Americans in the US, but even a little genocide is enormously unacceptable.

2. Extraction colonization.  This is the big one that fucked up more of the world than anything else.  This was what most of the colonization in Africa was.  The Europeans set up shop, threaten to kill anyone who resists, enslaves the population and has them dig up the rich natural resources that are abundant in Africa and then they transfer that material wealth back to Europe.  The only countries in Africa that avoided this were Ethiopia and South Africa - Ethiopia because they got lucky and it was the Italians who tried to take over instead of the French or the British, so they kicked their asses. South Africa was a settlement colony and, like all settlement colonies, underwent a genocide because of it. So how are the Africans supposed to keep up with the rest of the world's economies who keep advancing post-Industrial Revolution when all of their labor is just collected and shipped off to Europe where the Europeans can become rich off of it and the Africans can't?   The Africans are also unable to participate in the Industrial Revolution, not because they lack the resources or intelligence, but because their countries have been taken over and they work in a command economy set up by foreigners.

The extraction colonies have fallen for the most part, a big part of that is that WWII was too costly and the British and the French couldn't afford to defend their colonial possession anymore, and here's where - after stealing all wealth for hundreds of years - they really fucked things up.  European nations were allowed to develop their own borders as a result of their history.  After countless wars, massacres, and genocides in Europe, most people had a country that worked for them and the borders were rarely in dispute.  Instead of letting the borders of their colonies develop naturally, the colonizers just split lands and peoples willy nilly.

In 1947 the British thought it'd be a cool idea to split the nation of India between Hindu and Muslim.  Lord Mountbatten, the man behind the partition, didn't know shit about how to do that so he just drew two lines on a map and was done with it.  The result was 200K-2M deaths and 14M people displaced.  

Other genocides that occurred because the colonizers decided to put persecuted groups in new countries that were led by their persecutors - Rwandan Genocide, Sudanese Genocide, two Ugandan genocides. 

Other great moves - promising the people of Palestine that they'd get to keep their land after they were conquered.  Then promising the survivors of a German-led genocide that they'd get their ancestral homeland, which had just been given to another group. Now Israel and Palestine don't exactly see eye to eye, and they exist like this as enemies because of the artificial development of them as a nation that was caused by colonization. 

TL;DR - Africa had all their wealth taken for hundreds of years and then the colonizers just left and gave them shitty borders that they didn't want, putting opposing groups together and splitting their power for no real reason other than laziness and being dumb. Seriously, look at a map of Africa, all those straight lines on their borders are European colonizers just getting bored when figuring out how to split them.