Wars are won with logistics not guns. Getting troops and supplies across the country would be key to defending it from an invasion. The interstate highway syst

Wars are won with logistics not guns. Getting troops and supplies across the country would be key to defending it from an invasion. The interstate highway system was built in part for military purposes and partly designed by the Army: https://en.m.wikipedia.org/wiki/Interstate_Highway_System https://en.m.wikipedia.org/wiki/Interstate_Highway_System