For 32 years I have lived in the same house in Melbourne, Australia and 5 years more before then - nearby....and all up - about 60 years over 3 places. In that time the population of Melbourne has more than doubled [almost tripled] and in a few years will pass Sydney to be Australia's largest city. Instead we moved to Ballaarat [also in Victoria]...and only the 3rd largest city in Victoria, population 101 thousand.   And that got me to thinking.... The USA has 300 million peo...