The graph compares the changes of population in United StatesNigeria and Japan over a period from 1950 to 2050 It is claerly that the United States ranked first at the year of 1950 and will be overta

In conclusion, the population changes in United States, Nigeria and Japan are vastly different, with United States showing a steady growth, Nigeria experiencing a massive increase and Japan facing a decline. These changes are expected to continue in the future with Nigeria becoming the most populous country and Japan having a population similar to that of 1950.