Trump and the Great Wall

Perhaps your students noticed the other day when Trump compared the Great Wall to the one he wants to build on our Mexican-US border.  This might be a great way to mention (or more likely at this point in the year, re-mention) to your students.  As I used to say it is the Great Walls as you can see in the image above.  It also was started in the 3rd century BC.   Trump did get right that it is about 13,000 miles.  But as we know the Mongols did get through (or rather go around) it so in the end it didn't stop "immigrants" nor was it built very quickly or without great loss of life as you can see here.