Why do all historical accounts, even history books, include some form of subjectivity when they are supposed to be objective?'

Atheme from letter 4 in frankenstein is “friendship is sometimes born in the most unconventional places and situations.” this theme is conveyed through the conversations between walton and frankenstein, and these talks lead them to become confidants and friends. describe a theme from letter 3 of frankenstein and a different theme from letter 4. how are these themes conveyed in each letter? provide evidence from the text to support the themes expressed in each letter.

Plsss don’t worry about the green strip can someone plssssss

Iam giving 10 points and ! need asap