Brutus' vision of republic is outdated. Diversity of opinion is vital for a republic.
It's necessary for a republic to have people who represent all kinds of people in it. Different classes live different lives, and it's hard for a person who belongs to one class to be aware of the needs, manners, interests of people from a different class. For this reason, diversity is a very important part of a republic.
A republic should <em>NOT</em> be made up of a small group of people who think in a similar way. On the contrary, it <em>should</em> be made up of people from different backgrounds, in order to better represent its people.
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Settlers wanted land, chance to start a new life. Mountain men travelled west for adventure. Middionaries travelled to convert native American to shristianity.
A state of political and milatary tension after world war 2 between powers in the western Bloc