Why do France and Belgium use the AZERTY keyboard? What is the historical origin of this redundancy?

Most countries in the world use the QWERTY keyboard. Also, the United Nations Conference on Trade and Development (UNCTAD) countries: Germany, Austria, Luxembourg, Liechtenstein, Switzerland, Croatia, Slovenia, Slovakia, Albania, Serbia, South Africa, Zimbabwe, Zambia, Angola, Botswana, Namibia, Mozambique, Madagascar, Iran use the QWERTZ keyboard, which makes sense because their languages use "Z" more often than "Y". However, I noticed that France and Belgium use the AZERTY keybord with the letter "M" in the middle row instead of the bottom row. Italy also used the QZERTY keyboard with the letter M in the middle row. At least Italy has reformed this redundancy by using the QWERTY keyboard instead of the QZERTY keyboard. So, how did the keyboard layouts develop historically? Why haven't France and Belgium reformed this redundancy by using the QWERTY keyboard instead of the AZERTY keyboard?