Rank the following in chronological order from earliest to most recent.

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The classical definition of public health emerged in the 19th century, with a focus on preventing disease and promoting health through collective action. The first successful use of vaccines occurred in the late 18th century with Edward Jenner's smallpox vaccine. In 1854, John Snow traced an outbreak of cholera in London to a common water pump, establishing the importance of epidemiology and environmental health. In 1869, the Report of the Sanitary Commission of Massachusetts highlighted the need for public health reforms in the United States. Recognition of the link between poverty and health emerged later, with social determinants of health becoming a central focus in the 20th century.

Rank the Following in Chronological Order from Earliest to Most