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Flour is on of the basic food materials. It can be used for bread and for other types of food. General method of flour-making stayed the same for thousands of years - grinding. It is just that the technology progressed.
Bread is one of the most widespread types of food. It appeared at roughly the same time in different parts of the world made from flours that were available locally. Appearance of the bread marked changing of the society from hunter-gatherer to agricultural.
Wheat is the leading source of vegetable protein in human food and its history is long. It was one of the first crops that could be easily cultivated in larger quantities and with that it was a key factor enabling the emergence of city-based societies. Read more about history of wheat.
The greatest forward step in the baking industry since bread was wrapped! The Sliced Bread! But was it that great? Apparently it was. It replaced 80% of non-sliced bread in the first five years. The reason was convenience. Read about history of sliced bread.