The Great Great Wall: Along the Borders of History from China to MexicoDuring his campaign for the presidency, one of Donald Trump's signature promises was that hewould build a great great wall on the border between the US and Mexico, and Mexico wasgoing to pay for it. A year and a half into his term, with only a few prototype segments erected, thewall is the 2,000 mile, multibillion dollar elephant in the room of contemporary American life. In The Great Great Wall, architectural historian and critic Ian Volner takes a