The civil war and resistence fighters
Answer:
It's Demand
Two goods are substitutes if one can replace the other in consumption. If a substitute good becomes cheaper this shifts the demand curve in.
Thomas Edison invented the electric light bulb in 1879.
In this excerpt, the word tension means discomfort. Dr. King is saying that a certain level of discomfort is necessary for growth as a country. The group(s) that have been oppressing the black community are to expect nothing short of discomfort. Facing difficult emotions is the only way that we, as a community, can make any sort of change.
C the speaker is focused on his immediate fam
