Answer:
Nearly 95% of the Native American population was decimated due to smallpox. It spread to other continents and caused wide-spread deaths throughout the world. One can assume that smallpox in America, lead to deaths among European colonists and also resulted in defeat of the Native Americans.
Explanation:
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The two main reasons why Douglas opposed John Brown's plan to raid Harper's Ferry were that he was sure the plan would fall and lead to many black deaths, and he thought he would hurt the abolition movement by causing a backlash.
Soil not treated the way it was supposed to be, causing a huge layer of top soil that was easily blown up into the air. and the second was the great number of storms that occurred. The dust bowl suffocated many livestock and caused a great number of people breathing problems. Farms were destroyed due to dust killing all the livestock and crops not being able to grow because of the poor soil quality.
IT AFFECTED THEM BY THE WARS WE HAVE FOUGHT WITH THEM