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"were built upon" is correct and can be used in written English.
You can use it to mean that something was established or formulated based on something else. For example: "Over time, many ethical systems were built upon religious principles."
Exact(52)
Rousseau's more radical political doctrines were built upon Lockean foundations.
Similarly, some of the great aristocratic fortunes of the 18th century were built upon slavery.
Most international survey museums were built upon the existing collections of aristocrats or the donations of wealthy patrons.
Eerie harmonic layers were built upon the wordless syllables, an austere medieval aesthetic punctuated with colorful contemporary twists.
When walking through today's Financial District, know that the streets were built upon the bones of those early ships that carried in those wide‐eyed opportunists.
Some, like one in Rego Park, where a post office now stands, were built upon or paved over, the grounds now used for parking lots and other purposes.
Similar(7)
The health reforms can be built upon.
Conservative morality is built upon all them.
"2Face" was built upon a clever idea.
Those relationships can be built upon.
It is what our economy is built upon.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com