Portable Network Graphics. Portable Network Graphics (PNG /ËpÉªÅ/) is a raster graphics file format that supports lossless data compression. PNG was created as an improved, non-patented replacement for Graphics Interchange Format (GIF), and is the most widely used lossless image compression format on the Internet.
The slavery in the United States was a paradox because it contradicted the American ideal of freedom C. Slavery is one the black chapters in mankind history. It shows barbarian, immorality and misunderstanding.
How slavery was ended. The conventional wisdom is that social change takes place gradually, thanks to the actions of far-sighted political leaders, acting on behalf of the masses of people. The end of chattel slavery in America tells a different story. To abolish this terrible crime, it took an immense Civil War--and the Reconstruction period in the South that followed the war was the setting for a dramatic struggle to assure the equality of former slaves.