What was U. S. President Polk’s original reason for war with Mexico? What was the final reason?

https://millercenter.org/president/polk/foreign-affairs#:~:text=In%20late%20April%201846%2C%20Mexican,nations%20officially%20were%20at%20war.

Explanation:

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i hope this your understandings.

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.