Māori people peaceful tribes from their productive turangawaewae, such as the Moriori in the Chatham Islands by invading forces from North Taranaki, had a catastrophic effect on these conquered tribes. At the same time, the Māori suffered high mortality rates for new Eurasian infectious diseases, such as influenza, smallpox and measles, which killed an unknown number of Māori: estimates vary between ten and fifty percent. The spread of epidemics resulted largely from the Māori lacking acquired immunity to the new diseases. A huge influx of European settlers in the 1870s increased contact among many of the indigenous people with the newcomers. Te
Mexican–American War campaigns May, and, on August 1, 1848, the last American soldier departed for home. All the casualties among American soldiers in the Mexican–American War amounted to 1,192 killed in action, 529 died of wounds, 362 suffered accidental death and 11,155 soldiers died from disease. Disease claimed a toll seven times greater than that of Mexican weapons. Yellow fever epidemics, "La Vomito", exacted a terrible toll. In addition, diarrhea, dysentery and typhoid claimed lives amid the poor sanitation common to the army camps of this period. The casualties caused by disease in the Mexican Army have never been estimated but were probably