Yes there are many styles of Essay writing.
You can adapt anyone of these whichever suits you and there is nothing to get confused about.
The only thing being it must follow the basics of the essay e.g outline, introduction, paraghraphs must be tightly linked, correct english usage, argumentation in favor or against the statement, and arguments must be arranged in a sequence and many more basics of the Essay.
Adapt any style of writing which you feel comfortable with.
But the safest way would be to follow the generally used style in which most of the time history or background precedes the later events.