This Is something I have Always Wondered. The Mob Originated In Sicily But Soon Expanded To America, But I Always Wondered, Why Was It America, Why Not Russia, Or The U.K, Or China. If You Have AN Answer To This, Please Do Write It Down, As I Am Rather Curious.

In one word, "migration".

There was a very large migration of Italians in the late 19th century to America. They brought their customs, traditions and way of life with them. A small part of that was the Mafia, and it flourished here in the 20th century.

Well, America is the so-called "The land of oportunities" country, the country where you could improve and get good money, although there was an economic crisis in the 20s and 30s and part of the 40s it was much better than staying in Sicily.
Talking about inmigration, there was an important inmigration in Argentina(my country) in the late 19th century and the beggining of the 20th(including 10s, 20s, 30s, 40s, until 50s).
Many italian people came here, spanish people, and other cultures.(Some Nazis came here undercover with the approval of Juan Domingo Peron, the president since 1946 and 1951, it was the first time. He was president of Argentina 3 times, the second was relected 1951 and was kicked from the goverment in 1955 by the Army, and was elected in 1973 and died in 1974).

In Argentina there is 60% italian people, 30%Spanish people and 10% the rest of the other cultures.

In addition to immigration, I want to add several other factors that made organized crime--Mafia and other ethnic gangs--take hold in America:

First, at the turn of the 19th into the 20th century in America, big business was forming ruthless cartels and monopolies that squashed competition by force and corruption. They provided a strong economic model for organized crime.

Second, Italian, Irish, Jewish and Chinese immigrants to America generally regarded the authorities in their home countries as enemies, making them easy prey for gangsters of their own kind in America. The gangsters knew that their own people would never complain to the police. That's how they flourished in their own neighborhoods.

Third, Prohibition provided gigantic opportunities for organized crime gangs to make money on an unprecedented scale. Since few Americans supported Prohibition, criminals had little trouble in corrupting police and politicians at even the highest levels to protect their booze rackets. The money and influence they made helped the gangsters to spread out into other fields.

The business which created the maffia was also a reason. The maffia originated from corruption with the citrus-industry on Sicily.
Sicily was back then the biggest citrus-fruit exporter of the whole world, and the USA were the biggest importer. I guess the maffiosi wanted to be on both ends of the trading connection, in order to have more controle over it.

1. The migration policy of the US - "Give us your poor, your hungry..."
2. The prohibition in the thirties created a huge demand.
3. All the other opportunities and space in the US (eg: The empty desert space where now Las Vegas can be found as a result of banned gambling in other States).

Now that the Berlin wall is no longer there, we get the same in Europe; lots of gangsters from Russia, Ukraine, former Yugoslavia, etc are now partying in Amsterdam.

One thing to consider when thinking about the mafia coming to america is POLITICS.

the Mafia expanded in america because at this time it was a rich country.Like they say American dream.

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