During<span> the 1960s the availability of primary sources made historical research and</span>writing<span> possible and the debate became more vigorous. Historians Herbert Feis and Gar Alperovitz raised searching questions about the </span>first use<span> of nuclear weapons and their broader political and diplomatic implications.</span>
Answer:
19 -B --> makes the most sense based on the events in the diagram
20- C --> this is a long-term effect
Answer:
Agriculture caused human to form advanced societies and trade economies
Explanation: Humans no longer had to find and hunt food, they could grow their own and trade to others for goods and services while remaining staionary
Settlement of homesteading farmers on range land a series of server winters over production and overgrazing I hope this helps you could I please get a brainliest
