When Irish<span> (poor, and Catholic) immigrants landed in the mid-19th century US they changed. They jettisoned the core of their identity – the long struggle for freedom. They joined in the oppression of African-Americans.</span>
Arnold's experience best illustrates
"Echoic" memory.
Echoic memory is the tangible memory enroll particular to
sound-related data. The sensory memory for sounds that individuals have quite
recently seen is the type of echoic memory. In general, echoic recollections
are put away for somewhat longer time frames than iconic recollections (visual
recollections).
In the early civilization there was an upper and lower class relationship between government and social classes. Early civilizations came in existence in Lower Mesopotamia in 3000 BCE followed by "Egyptian civilization" (3000 BCE) along the Nile, Harappan (Indus Valley) civilization in the Indus River Valley (in Asian continent and at present time India and Pakistan, 2500 BCE).
The Chinese civilization established with "yellow and Yangtze Rivers" in 2200 BCE. In the recent times archeologists are searching in Tamil Nadu (India), found some vassals and other things which may have a connection with Indus Valley civilization.