Why did the US and the UN send troops when North Korea attacked South Korea?

Explica por qué el primer ciclo económico en brasil fue agrícola y no minero.

To what extent did mary lease's concepts of justice, freedom, and equality agree with those of samuel gompers and emilio aguinaldo? how did they compare with those of the pinkertons at homestead?

Explain the significance of martin luther king jr's letter from a birmingham jail and i have a dream speech