Which of these was not one of the 4 eras of immigration to the us?
a - colonial era
b- era of the 1930s
c- mid 19th century
d- period after 1965
e- turn of the 20th century

The following passage describes an example of __negative externality in the 1980s, manufacturing power plants in the midwest burned coal with high sulfur content, which when released as smoke, mixed with moisture in the atmosphere to create an acid that blew into canada and new england. the acid fell to the earth in the form of rain, killing fish and causing deforestation and building deterioration.

Where are the statements? ?