In what way are protesting a testing ground for a democracy

Protest is indeed a collective gesture of protest, opposition or dissension to a concept or behaviour, usually a democratic one. Protest movements can carry on several different ways, from personal declarations to widespread demonstrations.

In simple words, Protests act as a training ground for every democratic government-thus the freedom to a democratic demonstration is necessary and portray an internal part in promoting the use of freedom of speech. Democratic culture makes for a vigorous dialogue for those who differ on the topics.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".