How did the fourth crusade contribute to the byzantine empire’s downfall? it caused the death of the most able and respected byzantine emperor, leo iii. it left constantinople permanently damaged after the crusaders looted its valuables. it led to large-scale conflicts between the byzantine civilians and military forces. it unleashed a terrible plague on constantinople, drastically reducing its population. it showed the byzantine subjects the incompetence and cowardice of their rulers.

haitian revolution slaves initiated the rebellion in 1791 and by 1803 they had succeeded in ending not just slavery but french control over the colony

explanation: we can only guess at how our actions may be perceived in the future. doing something really big like killing lots of people, saving lots of people, affecting the lives of lots of people is a sure fire way of being remembered in historical records. we can also make a difference in the history records by being a small influence on something bigger, whether that is as a civil servant, scientist or artist.

of course you could argue that we all affect history just as tiny cogs in a   bigger machine.

if you mean how do people influence our opinions of things which have already happened, then simply by writing a book which looks at things form a different perspective and trying to convince people that this perspective is more accurate or truthful. people do it all the time i.e. richard the third was a terrible or was he? plenty would disagree, it's just that their views aren't the most widely known.n: