What documents are required for a European company to establish a U.S. branch?

We are Czech startup company that wants to establish a U.S. branch. All business will be conducted in Europe. We just need a warehouse and distribution in the U.S. Are there any limits for EU companies entering U.S. soil? Do we need to have an LLC or a corporation?

Non-U.S. residents can certainly open a business in the United States. Unless they're eager to be held personally liable for the acts of the company, their options are to form an LLC or a C Corporation. However, without knowing more about your business, it's hard to say whether there would be other restrictions or regulations you need to abide by. You may have customs issues; you'll certainly have tax issues; and possibly immigration issues. Make sure you get counsel who's experienced in dealing with international transactions for your industry.