Need suggestion for pre nuptial agreement

I am immigrant on student visa and i have 300k as my saving.
I am marrying a US citizen.

Is it okay to do pre nuptial agreement?
Is pre nuptial agreement is red flag for USCIS to approve marriage?
Is this property divisible on divorce as it's saving before marriage?
 
I am immigrant on student visa .
I am marrying a US citizen. She has 3 student loans and surgery loan before marriage.

If i get divorced . is am also supposed to pay her debts ?Is paying debts depends on state?
We are marrying in Iowa
 
All these questions are not immigration related question. This is an immigration forum for immigration related questions/process.
 
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