What is the difference between skilled manpower and unskilled manpower​

The short answer to your question is, if a person does their job well, they are skilled, if they don’t, they are unskilled.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.