Why is the war of 1812 often called the secondary war of indepence

The war of 1812 is often called the Second War of Independence, for Britain attacked and almost defeated the US (see burning of the White House) in an epic battle. However, it was not exactly a second war of independence, for the US was the one that initiated the conflict by invading Canada, then a colony of Britain. To gain wide-spread support, the US made it so that it sounded like the UK was the aggressor.

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the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!