How did ethnic enclaves and organizations like the six companies assist foreign migrants in becoming "american"? they bought tenement buildings and intentionally rented rooms to people of different backgrounds?

Ethnic enclaves and organizations like the six companies assist foreign migrants in becoming "american" by helping them with work and housing and provided educational opportunities such as learning English. When the slaves were educated then they become aware of their rights and understood that they are treated in bad manner. Hence the education was used a main tool in making slaves american.

That's true, it's a belief in one god