Slavery and colonialism are the two mantras aside from the Holocoust forever repeated for the White guilt.
But the facts are this:
1.
Slavery has been part of almost every culture. Islam had slaves until the 1980s and the current system is still doing. Almost every bloody society had slavery as a hallmark.
What people don't tell is that while Whites had joined the slavery bullshit for the gain of 1.7% (only they owned Slaves in the US - in Europe that was even lower), the truth is that European Whites ended actively slavery everywhere on Earth!
At one time from 1850-1900 the British navy employed up to 1/5 of their entire fucking fleet to end slavery! Slavery was also practiced by Africans enslaving other Africans - the British had once a constant military presence before the African coast capturing slave ships.
So - yes White Christianity joined slavery while Christianity initially wiped it out later, but they also FUCKING ABOLISHED IT AND ELIMINATED IT EVEN IN COUNTRIES THEY DID NOT RULE LIKE IN MUSLIM ONES!
Also I might add - the first 500.000 slaves in the US were White - Scots and Irish - sold at times at 10% the value of blacks and there were even laws forbidding the cross-breeding of those white-black slaves because it lowered the worth of the black slaves:
2. Colonialism:
I have also talked with some educated Africans and strangely enough those that have been to a never-colonized country like Liberia know that colonialism actually helped many countries in Africa.
Also I might add that again the entire colonialism bullshit was financially a disaster as only 0,1% of the society made great riches while the taxpayers in each country paid for the crap. That is why they quickly let go of the colonies.
There are scores of educated Africans who can see the positive influence of Whites in Africa - some even say that the Europeans left too early. They sure wished for equality and equal opportunity, but they did not mind the European leadership since that was often less corrupt and more competent than what they got under their own rule.
So I would not say that ALL CONQUESTS WERE EQUALLY BAD! There is a difference between being conquered by a tribe which brings superior tech and knowledge vs being conquered by a horde of rapists and savages who burn your cites, kill the men and rape the women - or later impose their medieval system that is inferior than the one they conquered (Arabs conquering Persia for example, Mongol invasions, sacking of Rome by the then primitive Northern European tribes).
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So in summary - I am not excusing neither slavery done by Christians in the last centuries nor the excesses of colonialism, but I am merely stating that in my opinion Whites had repaid for the errors of slavery by forcing others to end it - otherwise they would not have stopped.
And the colonialism aspect is remedied by having paid for the quick development of conquered nations. Liberia for example was created by the indigenous tribes and by freed slaves and is the least developed African nation there - it is not a coincidence. Liberia still has a GDP concentrated at a rate of 80% in agriculture like a country set in 1800. Even bloody Somalia is better than them!
And again - I am not calling colonialism good, but it was not as bad as some may think it was. There were however conquests in the past by other tribes were indeed just shit and pure slaughter. This was not it. We exalt the Romans and Greeks and their conquests because they actually brought an upgrade in science and technology to the conquered tribes - unfortunately they even managed to lose it themselves later.