This is a sentence fragment, because it is incomplete, it needs to be completed in order to be a sentence.
Answer:
During the American Revolution, which took place between 1775 and 1783 and culminated with the independence of the United States from Great Britain, much of colonial society found itself in the middle of a controversy: they felt both American and British, and could not opt by one or the other side.
Thus, several factors were the ones that were tilting the balance towards the American side: on the one hand, the hard work of the main leaders, the Founding Fathers, who through their work began to push society to support the Patriot cause; on the other, the diffusion that people like Thomas Paine made of the cause through the press and literature, with essays like the Common Sense; and finally, the feeling of oppression that society began to perceive in the face of the generalized punishments that came from the British Crown.
All of this were factors that contributed to generating a feeling of unity and patriotism in the vast majority of the population of the colonies, which in turn evolved into what we now know as the American identity.
Answer is : 1,099.55
879.55 + 220 = 1099.55
