The issue of slavery was avoided
US government has a limited power because it cannot do certain things, and specifically it is not allowed to breach certain individual freedoms: so it can be said that the motivation for a limited government is to protect individual freedoms.
See for example the text of the first amendment:
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof" - this limits the power of the government so that people have a freedom to practice their religion.
Answer: His video clip should be shorter than 30 seconds.
Explanation: A five minute video clip is a tad bit long for a speech. The video will have been okay if his presentation was a video presentation. But giving a speech and playing a video that long was bound to make the audience distracted and bored.
The answer to the blank space given in the question is self-regulation.
Self-regulation in this context means that as individuals in a civil society, a person should follow standards accepted by a nongovernmental entity despite not having the threat of a punishment if she or he chose to not follow the rule. Since nongovernmental entities do not have the same power as a government, an individual’s self-regulation would determine whether a person would abide by the standards set or not.