What is “the great highway of nations” to which madison is referring?

British cruisers have been in the continued practice of violating the American flag on the great highway of nations. This means that the great highway of nations would be the oceans.

Hope this helps.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.