The fact that americans disagree over whether eavesdropping on domestic phone conversations by federal antiterrorism investigators is necessary for security or a threat to democratic values demonstrates which "pillar" of democracy?

social, economic, and political pluralism

Pluralism is the notion that in liberal democracies power  should be distributed among a variety of economic and ideological pressure groups and  should not be held by a single elite or group of elites as this could result in tyranny

i think they would live in caves or natural tunnels

this act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.