In 1847 , Liberia proclaimed its independence from the ACS .
Of the 4,571 emigrants who arrived in Liberia from 1820 to 1843 , only 1,819 survived until 1843 .
In 1847 , Liberia proclaimed Liberia 's independence from the ACS .
Of the 4,571 emigrants who arrived in Liberia from 1820 to 1843 , only 1,819 survived until 1843 .