"Let us never forget this: since the day of the air, the old frontiers are gone. When you think of the defense of England you no longer think of the chalk cliffs of Dover; you think of the Rhine. That is where our frontier lies"

This quote by Stanley Baldwin is a pointer of the transforming nature of war in the contemporary period. With the invention of the plane, the standard limits of countries have become less appropriate. Rather than relying on physical obstacles such as the chalk high cliffs of Dover to shield England, the country needs to currently aim to the Rhine as its brand-new frontier. This quote works as a tip that the world is regularly changing which nations must be prepared to adapt to brand-new hazards. It also functions as a caution that nations must be vigilant in shielding their boundaries, as the typical techniques of protection might no longer work. In the contemporary globe, nations should be prepared to protect themselves from any prospective hazards, despite where they come from.