"Bleeding Kansas", this was a fight between North and South over Kansas and Nebraska to be a free or slave state
The meaning of this quote "A leader is best when people barely know he exists; when his work is done, his aim fulfilled, they will say; we did it ourselves" means if the leader is unknown to many people once he has finished or achieved a remarkable goal other people (such as Laozi) can steal the glory and be remembered for something they didn't do.
The answer is of course B - water.
Japan is consisted out of four big islands (Honshu, Hokkaido, Shikoku, and Kyushu). While each of them also has their own small characteristics, separate from each other, Japan has in general been isolated due to its specific geographical environment. Not being connected to any landmass such as neighbouring China, the only contact they could have had was by boat. And travelling by boat has always been more difficult compared to packing your stuff and going somewhere.
Answer:
During the Industrial Revolution, the US underwent a technological advancement and a remake of how the economy worked. One of these technological advancement was the assembly line, which helped speed up production, as well as create "specialized" jobs (jobs in which a worker specializes in a part of the creation, such as creation of the engine and only the engine for a car, for example, in case you are wondering - remove the parenthesis and content inside). These changes in how factories worked helped with the mass exodus of the population from the rural areas to cities for higher pays, which helped with the population boom, and the soon to be restructuring of how cities worked and the services they provided. Without the Industrial Revolution, the US would not be the economically (& later miliatry) giant that she is right now.
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