Sure thing dang. I should know by now it's pointless to get involved in these particular threads. Good call.

Slaves taken from Africa seem to be about 12 million over the course of 400 years. Churchill apparently was responsible for about 1.5 million dying by famine, plus another 2-3 million by epidemics (this is dwarfed by the up to 73 million that died by famine in the 200 years of British rule that preceded Churchill). Native Americans who died by colonialism is harder to count, because of very poor estimates of how many people were around before 1492 -- estimates range from 15 million inhabitants to 145 million. Current estimates seem to be about 100 million dying as a result of both disease and intentional genocide over the course of 500 years.

Put all of those deaths together, and we'll say

So all that to say, a lot of people have died in the things you've named, coming out to a little under 1 million per year. So dozens of millions dying per year is still a staggeringly large number (though helped along by how many people lived in the 20th century, compared to earlier centuries -- I didn't compare using a percentage of the world population.)