I was in the bookshop the other day and spotted a new book by Tim Marshall The Age of Walls: How Barriers Between Nations Are Changing Our World. Having enjoyed his previous books on geopolitics I was eager to get this and had it read in no time. Sorry I've been a bit slow to draw it to your attention. We're all aware of Trump's talk of a wall and many of us are old enough to remember the Berlin wall. Once you bring in Hadrian's wall (no mention of Offa's Dyke - not a wall I guess) and the great wall of China you are away. It is surprising to know how many walls and fences there are out there and with a good theme Mr Marshall manages to produce a book that is both interesting and informative and sometimes surprising.
The spiel says
“We are seeing walls being built along borders everywhere. Despite globalisation and advances in technology, we seem to be feeling more divided than ever. Thousands of miles of walls and fences have gone up around the world in the twenty-first century. At least 65 countries, more than a third of the world’s nation states, have built barriers along their borders; half of those erected since the Second World War sprang up between 2000 and now.”