Im not writing an essay but some topics that you can use for this are anything within 1775-1783
You can include details about Paul Revere, The Bill of Rights, The Constitution, The division between colonists from loyalists and patriots, and also about the Battle of Chesapeake.
Make sure to create a stance for what you believe was either the right side of the war, or which side was more just. It is an argumentative essay so include a thesis which is specific to one side