Identify and explain three technological innovations that led to improvements in agricultural production, trade, and transportation

The best examples for the improvement of agriculture would be the following:

Pottery , Wheels, Woven Textiles

These innovations were the turning point of Agriculture and pastoralism, and had  begun to transform human societies into a more evolved and modern technological world. 

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the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.