I have worked with international relocations without USA credit, and the important thing is to have solid documentation of your financial solidity, letters of employment, and other proof that you are in a position to repay a debt, regardless of where your primary residence is located. However, I do believe your best bet is to consult with a US mortgage broker/financial expert before proceeding.
Not to self-promote, as I hope I am helping you with your question: I work with a Schaumburg mortgage broker (named one of the top 20 brokers in Chicagoland) who will be able to answer your financial questions regarding getting a loan in the U.S. without credit. So you know, I won't get anything from it; I just happen to trust his expertise and he happens to be based in Schaumburg.
If you would like the info, please click on my profile and email me.
Best of luck.