Scientists used children as lab rats for research, it did not matter that they were children because they came from a Jewish/Traveller family, they were weak and could be taken care of quickly if anything happened. They would also be light and easy to hide from the Nazi public. See to youtube and search for the hangings of lab rat children by nazis for more info
They were treated poorly because of the same reason the Nazi's treated adult jews; it was because of their heritage. After they were sent into camps, it did not matter how old they were, no one was spared of his wrath. If you want to know exactly what happened to them with great visuals, I suggest plugging "Children of The Holocaust" into YouTube and finding a great visual explanation to go along with your research.
the united states solution i believe was the best because they were able to keep themselves up enough to last to world war 2 when they started to increase jobs because they had to build war machines like ships and tanks ect and since they had to do it fast they had to hire more people instead of some of the other countries how lessened the value of their money such as great Britain
the Monro doctrine was a statement saying if you attack any of our neighbors and wish them harm we will defend them this was a statement used to say hey america over here we putting our foot down and saying no to colonialism this also kicked of the war of 1812
