Answer:
hi!
Explanation:
Battle of Tannenberg, (August 26–30, 1914), World War I battle fought at Tannenberg, East Prussia (now , Poland), that ended in a German victory over the Russians. The crushing defeat occurred barely a month into the conflict, but it became emblematic of the Russian Empire's experience in World War I.
The end of the armed resistance by the Sioux Native Americans
Because he/she would lose money, because less people would be buying guns due to them being harder to get.