These days various nations have cosmopolitan cities with individuals residing from all over the world. Although, most of the humans even if from different religion, caste, culture, language, and country live peacefully at one place or city. However, there are instances where these differences come in way of maintaining harmony. Legal higher authorities can ensure that these people can live harmoniously together by making few rules, which I shall discuss below.
Firstly, globalization has reduced the gap between various countries, people have the democracy to cross boarders and settle in the cities they prefer the most. Additionally, individuals living in the same country also prefer to move and settle in cosmopolitan areas as such places provide more job opportunities, low cost of living, more exposure to gain great experience, good number of schools and colleges, facility of public transport and great medical facilities. For instance, in India the highest population resides in metropolitan cities like Mumbai and Delhi because these cities have all the advantages which humans fail to receive in their small hometowns.
In such places, individuals live together and there are instances where difference in caste, religion, culture, or language come in way of people living with harmony. Then comes the role of government who should frame certain rules which needs to be followed for example rule that there will be no discrimination in any place in relation to color, caste, religion or language. In addition, awareness should be created amongst everybody that each one should respect each other as people living in same city and nation belong to one place and country and are not distinct in any way. Taxation rules should be kept same for all living in the same city. Facilities and advantages that these places offer should be available for every person living in the city such as using public transport or medical facilities, job opportunities, and educational institutions.
To conclude, I believe that each individual should try to maintain harmony and live together as they are part of same city and nation. However, there should be constant support of the government to check if all these people actually live together without getting involved in any kind of fights and harmoniously. 
These days various nations have cosmopolitan  
cities
 with  
individuals
 residing from all over the world. Although, most of the humans even if from  
different
 religion, caste, culture, language, and  
country
  live
  peacefully
 at one  
place
 or city.  
However
, there are instances where these differences  
come
 in way of maintaining harmony. Legal higher authorities can ensure that these  
people
 can  
live
  harmoniously
 together by making few  
rules
, which I shall discuss below. 
Firstly
, globalization has  
reduced
 the gap between various  
countries
,  
people
 have the democracy to cross boarders and settle in the  
cities
 they prefer the most.  
Additionally
,  
individuals
  living
 in the same  
country
  also
 prefer to  
move
 and settle in cosmopolitan areas as such  
places
 provide more job opportunities, low cost of  
living
, more exposure to gain great experience,  
good
 number of schools and colleges, facility of public transport and great medical facilities.  
For instance
, in India the highest population resides in metropolitan  
cities
 like Mumbai and Delhi  
because
 these  
cities
 have all the advantages which humans fail to receive in their  
small
 hometowns.
In such  
places
,  
individuals
  live
 together and there are instances where difference in caste, religion, culture, or language  
come
 in way of  
people
  living
 with harmony. Then  
comes
 the role of  
government
 who should frame certain  
rules
 which needs to  
be followed
  for example
  rule
 that there will be no discrimination in any  
place
 in relation to color, caste, religion or language.  
In addition
, awareness should  
be created
 amongst everybody that each one should respect each other as  
people
  living
 in same city and nation belong to one  
place
 and  
country
 and are not distinct in any way. Taxation  
rules
 should be  
kept
 same for all  
living
 in the same city. Facilities and advantages that these  
places
 offer should be available for every person  
living
 in the city such as using public transport or medical facilities, job opportunities, and educational institutions. 
To conclude
, I believe that each  
individual
 should try to maintain harmony and  
live
 together as they are part of same city and nation.  
However
, there should be constant support of the  
government
 to  
check
 if all these  
people
 actually  
live
 together without getting involved in any kind of fights and  
harmoniously
.