Historical reason behind different line ending at different platforms

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DOS inherited CR-LF line endings (what you’re calling \r\n, just making the ascii characters explicit) from CP/M. CP/M inherited it from the various DEC operating systems which influenced CP/M designer Gary Kildall.

CR-LF was used so that the teletype machines would return the print head to the left margin (CR = carriage return), and then move to the next line (LF = line feed).

The Unix guys handled that in the device driver, and when necessary translated LF to CR-LF on output to devices that needed it.

And as you guessed, Mac OS X now uses LF.

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