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.
But by the mid-nineteenth century, the ideological contradictions between a national defense of slavery on American soil on the one hand, and the universal freedoms espoused in the Declaration of Independence on the other hand, had created a deep moral schism in the national culture.