The niche is the part of the potential niche that allows a species to survive and avoid competition with other species and organisms
for the same resources.

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

hope this

1 > george s. boutwell

2 > general ulysses s. grant

3 > james a. garfeild

4 > adolph e. borie