Use file to get each line of the file. Then iterate each line, append your text and save the file using file_put_contents.
If it's in the file, use file() to read the file, you'll get array of lines. If it's a string, use explode("\n", $string). If you don't know the separator, you can use preg_split("/(\n|\r|\n\r)/", $string).
Then loop over the elements of the array and prepend the string, then use join("\n", $arr) to convert array back to string. If you need to preserve separators, use preg_split as above with PREG_SPLIT_DELIM_CAPTURE option and skip delimiters when prepending strings. If you used file() the line ends are already there, so use file_put_contents("newfile", join('', $arr)) to write it back.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.