During the industrial revolution, more people were needed in factories than in farms. This migration from farms to cities was known as the business revolution.
If you are referring to the United Nations speech, if they love their children they should stop destroying the environment because the destroyed environment will be the environment where their children will live. She even says that it's alright if they can't fix it, someone else will fix it, they just need to stop destroying it.
The significance was that these allowed goods to be transported much faster than by horse. Canals allowed for things to be imported and exported much more easily.
The correct answer to this open question is the following.
The question does not include options. We do not know the name of the individuals you are referring to. You also did not mention what period in the history of the US you are referring to.
So although your question is incomplete, we can help you answer in the following general terms.
We assume you are referring to the Progressive era in the United States history from the 1880s to the 1920s.
During this era, many reformers demanded changes in US politics and economics. After many injustices lived during the Gilded Age, muckraker journalists exposed the corruption activities of many legislators and politicians. The federal government created legislation to stop this situation and also created laws to eliminate monopolies in the economy.
So we can say that reformers built a foundation to change the political and economic scene in the US, as well as society.