They replaced him with Mobutu Sese Seko a kleptocratic and murderous dictator, whom they supported for most of his reign.
"The report concluded that Belgium had not ordered Lumumba's assassination"
And
"In 2013, the U.S. State Department admitted that President Eisenhower authorized the murder of Lumumba.
However, documents released in 2017 revealed that an American role in Lumumba's murder was only under consideration by the CIA.
CIA Chief Allan Dulles had allocated $100,000 to accomplish the act, but the plan was not carried out."
"In the early 21st century, writer Ludo De Witte found written orders from the Belgian government that had requested Lumumba's execution, and documents on various arrangements, such as death squads"
I realise that this may be a bit of confirmation bias on my side, regarding which of these I believe.
If we are comparing the character and proposed world order of China vs. US (or whoever else), we should be focused on the present: that which is actually on the table to choose between.
North of Africa is a mess. A lot of Sub-Saharan is ruled by strongmen. And even the places where there is actually democracy the state apparatus usually tries to rig elections in favor of current rulers.
Both by territory and population I am willing to bet that the people that live in countries with free and fair elections with peaceful transitions between administrations are a minority.
It's staggering how insulting your comment is. How would you feel if somebody invaded your country, dismantled your government, decided who got to rule you, and told you it was all for the best and you probably didn't even lose out. Would you like it?