How have you experienced a form of a tribalism? What was your value system and how did it feel to share it with others?

This is how you achieve tribalism. It is the most dangerous psychological ops game the Deep Statists have played thus far. Tribalism was well-explained by Ayn Rand in numerous publications and you can find good overviews of it at the Atlas Society web site. I encourage you to familiarize yourself with the information they provide.

d is the best answer for this question.

answer: from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain, that this nation under god shall have a new birth of freedom, and that government of the people

explanation: