The violence has driven many families to seek safety by migrating to areas where their religious group predominates, reinforcing the sectarian tide.

Many Brooklyn neighborhoods are ethnic enclaves where particular ethnic groups and cultures predominate.

In some ways, Woodlawn is a throwback to an earlier New York, when one or two ethnic groups predominated in a neighborhood.

As a rule, no group predominated in sufficient force to start massed trouble.

An ethnic enclave is a community of an ethnic group inside an area in which another ethnic group predominates.

Despite this astounding diversity, groups tend to stay within enclaves in the borough; even in mixed blocks, one group or another predominates in each individual building.

"Two groups predominate: One group tends to be four years out of college and the other large group has been out 13 to 15 years," he said.

But that very strength among black Democrats counts for much less among the general electorate because no single ethnic or racial group predominates .

Numerous small groups of farms, isolated farmsteads on their own land, cottages and roadside settlements predominate.

However, three main groups of theories predominate.