Answer:Many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change. Some experts believe the drying of the Saraswati River, which began around 1900 BCE, was the main cause for climate change, while others conclude that a great flood struck the area.
Explanation:
Immigration to the north provided workers for production and replacements for soldiers killed or wounded.
Letters would be an example of a primary source
British tyranny in the colonies would not be tolerated. The Declaration was a document that officially States that the colonial are claiming their independence. The US constitution was an official document that came after the articles of confederation that United the States and established a federal government.
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