Answer: Europeans brought deadly viruses and bacteria, such as smallpox, measles, typhus, and cholera, for which Native Americans had no immunity
Explanation: These diseases decreased the Native American population and caused an ecological and economical imbalance.May 13, 2019(Fzrom My history folder)
Over 20 million people were injured in World War 1. Over 8 million died and 5 million were held prisoners.
A. European imperialist powers gained further control of trade with China.
I think is the corps of exploration
B. American leaders feared Japan would never surrender without horrific losses.