what are the effects of mass migration has had on the ethic composition and ghettoizing of modern cities?

Answer 1

Probably one of the most relevant mass migration phenomena impacting ethic composition and ghettoization of American cities has been the one termed 'white flight'. Wikipedia actually has an excellent summary of this phenomenon. An excerpt follows but you should check out the whole article:

History
In the years after World War II, White Americans began to move away from inner core cities to newer suburban communities. Major cities had experienced tight housing markets during the war years along with an influx of blacks seeking war work. White people with the means to leave sometimes did so to escape the increasing racial tensions they observed on television news reports of the volatile Civil Rights Movement, which they thought generated crime in inner cities between radical racists and new black residents. In other cases, Whites left simply because they thought that suburban communities, with their new housing stock and schools and their open spaces, were more desirable places to live. Prior to the Fair Housing Act of 1968, due to racist real-estate covenants, redlining, and other discriminatory practices, non-white peoples were rarely allowed to move away from the cities, even when they may have been economically able to do so.

As the wealthier white residents abandoned the inner city neighborhoods, they ultimately left behind increasingly poor non-white populations whose neighborhoods rapidly deteriorated in the 1950s and especially in the 1960s, as in many cases even trash collection was halted. White people quickly took their tax and investment dollars and services, such as teachers, grocery stores, and clothing retail with them. The 1967 Detroit 12th Street Riot is probably the worst case reaction to these events in US history. With no local jobs or businesses, the neighborhoods disintegrated and ultimately turned into increasingly poverty-stricken and crime-ridden slums with failing and dilapidated public schools.

An important element of this migration of well-to-do whites was the availability of federally subsidized home mortgages (VA, FHA, HOLC) which made it possible for families to buy cheap, new homes in the suburbs — but not to rent apartments in cities.[citation needed] State and federal governments also subsidized white flight by paying for highways to carry suburbanites to work in cities where the jobs remained (the National Defense and Interstate Highway Act and its successors) and by changing tax codes[citation needed] to benefit suburban "minimal cities" ("the Lakewood Plan"). This plan further divided and isolated black neighborhoods from goods and services, many times encircling them within industrial corridors.

Answer 2

you really slaughtered that one. The question made me think of the commercial "herding cats" Think bud or miller put it out. Very funny. look for it on google video. Back to you question, well the migration which took place around the time Moses was coming out of Egypt, did not have much of an effect on the ghettos of Europe in later centuries. Most of that lies on Hitlers head. That do it?

Answer 3

It has helped to add to the rose garden of humanity that we see around us. There are a number of economic problems with th emigration, but these will eventually be solved when a world federal government is established.