<span>The United States becomes the first and only nation to use atomic weaponry during wartime when it drops anatomic bomb on the Japanese city of Hiroshima. Though the dropping of the atomic bomb on Japan marked the end of World War II, many historians argue that it also ignited the Cold War.</span>
He invented a boat that was used in the D-Day invasion.
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Answer:
Germ Theory
Explanation:
Germ Theory was in its early stages and with its discovery brought on a cascade of medical discoveries, all of which helped save the lives of the afflicted.
Arab merchants brought news of their religion as they traded in different areas. There was a cultural exchange and due to international trade, Islam spread to other parts of the world.
