Even though capitalists and their inheritors convinced many, 'countries' didn't have colonies, companies and individuals often did, and 'countries' sometimes were instructed by them to participate in their commercial endeavors. Most citizens ancestors in former colonial countries were often no less oppressed by their ruling classes and factory owners as natives in the colonies.
Current ancestors of those working classes are not responsible for their ancestors oppressors. To the contrary. Both people in now former colonies and former colonists are by and large co-victims. While capitalists wealth was largely spent in their native lands and so workers there profited through trickle down economics, we should be very careful validating that slowest of the slow of economic models. It is a malicious model, like colonialism was malicious. It is in workers interest around the globe to correctly identify their oppressors, and not be played against each other and let true inheritors of much of that ill-gained wealth 'socialize' their losses upon their states.
I'll not go into detail into how colonialism actually was differently implemented across Europe (e.g. you may say the State was far more core to colonialism in France, whereas in Belgium it was the king personally owning the colony, and in the Netherlands it was company property). The core of my argument is that the since there isn't a European alive who's ever profited off a slave in the colonies back, the only way to make former colonialists return all their wealth would mean turning this into a sort of blood feud that would never end.
Let's not take Israeli-Palestine as a model. Let's rather think of ways to engrain the idea equality between people worldwide is both fair and the most effective method in preventing conflict, and think of ways of how to implement such a global wealth sharing in ways other than accounting for past rulers/capitalists of fences over which very few had any day, let alone influence, certainly noone alive right now. Let's begin by cracking down hard on current day slavery, and all forms of labour related abuse.
Average humans in former colonist countries are not enemies with average humans in former colonies. The opposite.