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American Exceptionalism seems to be merely an extension of Manifest Destiny in a post Industrial world while Manifest Destiny is an ideology that i think can be seen as pre-industrial Nationalism. Is there any truth to this or have i gotten it wrong?
American Exceptionalism came first, long before industrialization.
One of the first expressions of the idea of "American Exceptionalism" came very early in the history of America, in John Winthrop’s famous “City on a Hill” sermon to the Puritan colonists on the ship Arabella, just before they landed in Massachusetts in 1630.
In this speech, Winthrop was referring to the Bible, Matthew 5:14, Jesus’s “Parable of Salt and Light” in the Sermon on the Mount, where he tells his listeners,
“You are the light of the world. A city that is set on a hill cannot be hidden.”
Winthrop, on the Arabella, preached,
“wee shall finde that the God of Israell is among us, when tenn of us shall be able to resist a thousand of our enemies, when hee shall make us a prayse and glory, that men shall say of succeeding plantacions: the lord make it like that of New England: for wee must Consider that wee shall be as a Citty upon a Hill, the eies of all people are uppon us;”
Source: https://www.mtholyoke.edu/acad/intrel/winthrop.htm
This plea, or prayer, or aspiration, that Americans should be exceptional, should be a “City on a Hill” resonated. It has been quoted many times by American politicians and presidents, notably and famously by John F. Kennedy and Ronald Reagan.
So, the strand of thought that America should be exceptional, or should strive to be exceptional, (or even that America is exceptional) and the common (though not universal) corollary, that this is based on divine providence, is a long standing theme in American discourse.
The idea of American Exceptionalism dates back to the founding of the colonies. The idea has remained popular and prevalent ever since. So, it long pre-dates the industrial revolution in America.
Manifest Destiny, however, as a concept, generally post-dates the start of industrialism (though America was still largely a rural nation at the times when Manifest Destiny was most Manifest).
Short answer is no. American exceptionalism can be seen in American history before there was a US to pin it to, and Manifest Destiny is certainly visible after the largest industrialization periods of the 19th century.
I realize this is a very vague answer but I don't have time at the moment to get into specific details. I'll come back later if I can.