I'm not sure which work you're referring to. The three of us can read it online. If you can provide more information or context, I will try my best to provide you with a more accurate answer.
The back story of 'The Last of Us' is centered around a global catastrophe caused by a fungal plague. The Cordyceps fungus, which normally infects insects, adapts to humans. As the infection spreads, governments fail, and order breaks down. People are forced to fend for themselves in a world filled with infected and other desperate survivors. Joel, a hardened survivor, is tasked with escorting Ellie, a young girl who may hold the key to a cure. Their relationship develops against the backdrop of this tragic back story.
You could check out platforms such as MangaFox or MangaStream. But keep in mind that the availability of the specific manga might vary. Also, make sure to use legal and authorized sources for a better reading experience.
One important aspect is the struggle for independence. The colonists were tired of being under British rule and fought for their own nation. Another is the role of immigration. People from all over the world have come to the US, adding to its cultural richness. Also, the westward expansion was crucial, as it increased the size and resources of the country.
The 'US back story' is complex. It began with the arrival of European settlers. They came seeking new opportunities, religious freedom in many cases. The colonies grew over time, and there were various interactions with Native Americans, some friendly, but unfortunately many were not. Eventually, the colonies united to fight for independence from Britain, which led to the birth of the United States as we know it today.
It could be Harry Potter himself. He's always been one to help others, especially those in need. He might see a new student being harassed by Slytherins and step in, saying 'one of us will help you'.