The Americans called the War of 1812 the "Second War for Independence", because the War of 1812 was against the British (which was their previous rulers). 1812 was when the British once again tried to take back the Colonies.
The US won once again, and it was known of the "SWfI" because it was against Britian (which was the strongest nation during that time
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The main cause of shays rebellion where the large amount of debt the farmers where experiencing in the 1780s. another cause is the lack of economic crisis laws in massachusetts. Some other causes where because of bad harvests economic depression and high taxes threating farmers with the loss of their farms.