Science and Medicine
Liberia, officially the Colony of Liberia, later the Commonwealth of Liberia, was a private colony of the American Colonization Society between 1821 and 1847, when it declared independence and became the Republic of Liberia. It was not recognized by the United States until September 23, 1862.
Diseases and epidemics of the 19th century.
COVID-19 pandemic in Beijing.
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