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.
1 A good discussion on the issue of slavery in the American Revolution can be found in Gary Nash, Race and Revolution (Madison, Wis.: Madison House, 1990). 2  William W. Freehling, Prelude to Civil War: The Nullification Controversy in South Carolina, 1816â1836 (New York: Oxford University Press, 1992).