Without more information on your intention and the target market's use for the application, itself, the simple answer is "yes." Many digital products available for US consumers are developed/launched outside of the States.

Assuming your product is targeted for the US market, you can surely launch your product in the U.S. even though you are outside.

I am working with a couple of startups that have the core tech/leadership team that is international but still have a presence in US. They are seeing operational/financial benefits to the model in early stages of product/market development. As they are seeing traction, they intend to hire sales/BD functions here.

You are able to form your company, have a remote office and complete all the legal formalities even though you are outside the US. Happy to share detailed feedback over a call and help with your decision making.

Read this story...http://www.businessinsider.com.au/atlassian-the-untold-story-how-two-australian-young-guns-built-a-company-headed-for-a-billion-dollar-ipo-2014-2