The interview and test questions should not be any challenge at all to a native English speaker with a vague awareness of US history and an equally vague awareness of how the government of the US is organized.

Back in 2007, my interview was an hour long, which appeared to be standard, of which 10 minutes was spent on the matter in hand. The rest was spent shooting the breeze about, in no particular order: the Falklands war, the Gulf war(s), Saddam Hussein and other Middle Eastern despots, the (then current) Afghan war and previous conflicts in Afghanistan, the method of government in the UK, the Royal family, the history of the Royal family and how it relates to the government of the UK, including the Act of Union, renovating houses, in the UK and US, rewiring work and US v UK electrical standards, plumbing, roofs, and other sundry construction topics, such as hardwood flooring, crawlspaces the joys of working in them, and how to deal with the dirt, damp, and the bugs and critters you might find down there. It was a busy hour!