the 1918 flu pandemic. A significant precursor virus was harbored in birds, and mutated to pigs that were kept near the front. The exact number of deaths is unknown but about 50 million people are estimated to have died from the influenza outbreak worldwide. In 2005, a study found that the 1918 virus strain developed in birds and was similar to 21st century 'bird flu'.

Formation of national identities

After 123 years, Poland

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