Frederick Engels 
The Condition of the Working-Class in England in 1844 [EPUB ebook] 

The history of the proletariat in England begins with the second half of the last century, with the invention of the steam-engine and of machinery for working cotton. These inventions gave rise, as is well known, to an industrial revolution, a revolution which altered the whole civil society; one, the historical importance of which is only now beginning to be recognised. England is the classic soil of this transformation, which was all the mightier, the more silently it proceeded; and England is, therefore, the classic land of its chief product also, the proletariat. Only in England can the proletariat be studied in all its relations and from all sides.