The Great Wall of China is the longest building on earth with a length of 13,170 miles. Made from a combination of brick, stone, wood and other materials, it was originally constructed primarily to serve as a defence against the nomadic invasions from the north that threatened Chinese states / empires.
On August 31, 1935, Congress passed<span> the first </span>Neutrality Act<span> prohibiting the export of “arms, ammunition, and implements of war” from the United States to foreign nations at war and requiring arms manufacturers in the United States to apply for an export license.</span>
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There is not a lot of solid information on Osman I who established the Ottoman dynasty around 1300 CE. He was the hereditary leader of a small principality in Anatolia.
Expanded trade, regional empires, and increased global trade are all effects of which of "<span>b. the transition from river valley civilizations to classical civilization," since classical civilizations engaged in more far-reaching trade and cultural diffusion. </span>
