Discuss the similarities and/or differences between the external borders of European Union (EU), the U.S. - Mexico border and the U.S.-Canadian border? Explain how the borders within the EU have changed since the "Cold War"?

The post needs to be at least 400 words in APA format. Please use the link below for resources/sources and refer to Week 8. 

https://myclassroom.apus.edu/d2l/le/enhancedSequenceViewer/25704?url=https%3A%2F%2Ff54cbe36-23a9-4505-85fe-e251f80ec34d.sequences.api.brightspace.com%2F25704%2Factivity%2F2252276%3FfilterOnDatesAndDepth%3D1