Most housing within the various ethnic enclaves could be considered what?

It would be considered Tenements.

The right answer is Tenements

Explanation:

During the 19th century with the rising of immigrants in the US, buildings whose previous owners were single-family were divided into various living spaces to adapt to the population. There were narrow, low-rise apartments that were overcrowded, unwell set alight and were deficient in indoor sanitation and suitable ventilation. By 1900 more than two-thirds of the population were living in this kind of building known as tenement.  

folds are formed when heat and pressure is applied to the rock. the higher the temperature, the more pliable rocks become. folds are more likely to occur when the deformation caused by the compression is applied slowly. faults are defined as the displacement of rock that were once connected along a fault line.

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