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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.
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.
Tortillas are a simple food but maybe because of that they appeared in many places of the world at the around same time and are still popular as they were when they were necessity. Read about history of tortilla.
Yeast, in its many forms, is today an essential ingredient in bread making. It makes bread lighter and tastier. It wasn’t always so. But thanks to some forgetful baker we can today enjoy in tasty baked goods. Read about history of baker’s yeast.