A caption plz!!!?

well i gotta have a caption for my history class but i really don't know what caption can fit with my picture so if anyone can plz tell me what is a caption for a picture about the annexation of texas that it broke america apart and like allowed slavery coz my teacher told us that a caption adds to the messege of the picture but doesn't describe it and i don't really get it.


PLZ HELP!!!


THNXA caption plz!!!?
Do you have a link to the picture?

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