Why was the Morse code hard to break?

The Morse "Code" is not a security cipher, and is not hard to break. It is a system of simple aural equivalents for the letters, digits, and punctuations. With a relatively modest period of study and practice, any person of average intelligence can become proficient at recognizing the sounds and transcribing them into alphabetic text. The code sounds themselves are designed to be easily recognizable, to elucidate rather than conceal, and to require the minimum effort to "break".
The Morse "Code" is not a security cipher, and is not hard to break. It is a system of simple aural equivalents for the letters, digits, and punctuations. With a relatively modest period of study and practice, any person of average intelligence can become proficient at recognizing the sounds and transcribing them into alphabetic text. The code sounds themselves are designed to be easily recognizable, to elucidate rather than conceal, and to require the minimum effort to "break".