The answer is George Stephenson. He is credited for the inventing of the steam locomotive called the rocket or "Stephenson's Rocket"
Toussaint L'Ouverture fought with Jean-Jacques Dessalines.
I'll first explain what the non-aggression pact was. It was an agreement that the Soviet Union and Germany would take no military action against each other. To answer your question it is B. The pact was to make sure he could safely attack Poland.
One of the advantages was that the old mom & pop stores were no longer practical, because the corporations were more convenient. You didn't have to ride around to go to seven stores anymore, you would just go to the big-block store and get everything you needed there. Furthermore, corporations provided a large amount of unskilled jobs - previously, the largest part of the "American dream" was to go and start your own business, farm, etc., but now you could go get a job at a factory or supermarket, so the job market was diversified. Those are just two, but I'm sure you can think of more!