Quoted from noob-a-tron:
Guys you are imploding on the internet what chance has America got. China will win. I just hope us Aussies do not turn on each other also but i think we will. Also remember facts The Spanish Flu originated from a military base in Kansas. America dropped 2 big bombs on Japan so come on stop who did this who did that crap. It happened move on and fight it together.
People really need to stop calling things facts that are just hypothesis, theories or opinions. Your so called fact is not true. It is one of several hypothesis.
The Spanish flu did not originate on a military base in Kansas. In the US it was first diagnosed there but that doesn't mean it originated there.
Here is another hypothesis. May 22, 2018 - More recently, experts have proposed a third hypothesis: The Spanish flu originated somewhere in northern China in late 1917 and swiftly moved to western Europe with the 140,000 Chinese laborers the French and British governments recruited to perform manual labor to free up troops for wartime duty. From History.com
And from wikipedia.org
Hypotheses about the source
The major UK troop staging and hospital camp in Étaples in France has been theorized by researchers as being at the center of the Spanish flu. The research was published in 1999 by a British team, led by virologist John Oxford. In late 1917, military pathologists reported the onset of a new disease with high mortality that they later recognized as the flu. The overcrowded camp and hospital was an ideal site for the spreading of a respiratory virus. The hospital treated thousands of victims of chemical attacks, and other casualties of war, and 100,000 soldiers passed through the camp every day. It also was home to a piggery, and poultry was regularly brought in for food supplies from surrounding villages. Oxford and his team postulated that a significant precursor virus, harbored in birds, mutated and then migrated to pigs kept near the front.
A report published in 2016 in the Journal of the Chinese Medical Association found evidence that the 1918 virus had been circulating in the European armies for months and possibly years before the 1918 pandemic.
There have been statements that the epidemic originated in the United States. Historian Alfred W. Crosby stated in 2003 that the flu originated in Kansas, and popular author John Barry described Haskell County, Kansas, as the point of origin in his 2004 article. It has also been stated by historian Santiago Mata in 2017 that, by late 1917, there had already been a first wave of the epidemic in at least 14 US military camps.
A 2018 study of tissue slides and medical reports lead by evolutionary biology professor Michael Worobey found evidence against the disease originating from Kansas as those cases were milder and had fewer deaths compared to the situation in New York City in the same time period. The study did find evidence through phylogenetic analyses that the virus likely had a North American origin, though it was not conclusive. In addition, the haemagglutinin glycoproteins of the virus suggest that it was around far prior to 1918 and other studies suggest that the reassortment of the H1N1 virus likely occurred in or around 1915.
One of the few regions of the world seemingly less affected by the 1918 flu pandemic was China, where there may have been a comparatively mild flu season in 1918 (although this is disputed due to lack of data in the Warlord Period of China, see Around the globe). Multiple studies have documented that there were relatively few deaths from the flu in China compared to other regions of the world. This has led to speculation that the 1918 flu pandemic originated in China. The relatively mild flu season and lower rates of flu mortality in China in 1918 may be explained due to the fact that the Chinese population had already possessed acquired immunity to the flu virus.  However, a study by K.F. Cheng and P.C. Leung in 2006 have suggested it was more likely because the traditional Chinese medicine played an important role in prevention and treatment.
In 1993, Claude Hannoun, the leading expert on the 1918 flu for the Pasteur Institute, asserted the former virus was likely to have come from China. It then mutated in the United States near Boston and from there spread to Brest, France, Europe's battlefields, Europe, and the world with Allied soldiers and sailors as the main disseminators. He considered several other hypotheses of origin, such as Spain, Kansas and Brest, as being possible, but not likely. Political scientist Andrew Price-Smith published data from the Austrian archives suggesting the influenza had earlier origins, beginning in Austria in early 1917.
In 2014, historian Mark Humphries argued that the mobilization of 96,000 Chinese laborers to work behind the British and French lines might have been the source of the pandemic. Humphries, of the Memorial University of Newfoundland in St. John's, based his conclusions on newly unearthed records. He found archival evidence that a respiratory illness that struck northern China in November 1917 was identified a year later by Chinese health officials as identical to the Spanish flu.
A report published in 2016 in the Journal of the Chinese Medical Association found no evidence that the 1918 virus was imported to Europe via Chinese and Southeast Asian soldiers and workers and instead found evidence of its circulation in Europe before the pandemic. The 2016 study suggested that the low flu mortality rate (an estimated 1/1000) found among the Chinese and Southeast Asian workers in Europe meant that the deadly 1918 influenza pandemic could not have originated from those workers.
A 2018 study of tissue slides and medical reports lead by evolutionary biology professor Michael Worobey found evidence against the disease being spread by Chinese workers, noting that workers entered Europe through other routes that did not result in detectable spread, making them unlikely to have been the original hosts.