I found it much more interesting then math which bored me to tears.
Your interest is current right?
"I found find it "
Our ancestors struggled and sacrificed for us we owe it to them to understand who they were and what they dealt with in their life.
Try putting "since" in the beginning of the sentence and a comma after "us" for more flow.
"life" should be "lives"
Modern history interests me most of all because it is most easy to relate to how the drama of history has created the world we live in now
Use easiest instead of "most easy" since you already used the word most earlier in the sentence.
This is just an opinion but: you can try using a synonym of "drama" since you used the world in the previous sentence.
History even though it's in the past still gives us insight into the future and thinks to come.
Did you mean things?
To my success in history subjects, I owe that to my teachers that have encouraged my love of history. There are not many teachers that can recognize a child's passion and encourage then to purse it further.
Your teachers are people so it should be,
teachers WHOAlso omit "that" in the first sentence after "owe"
In the second sentence, I believe you meant
"them" instead of
"then"Overall, I think you communicated and showed your passion of history well :)