To be in slavery means that you are being owned by the state or a person which means that the state or the person that owns you and can do anything they want to do to you such as labor,sexually abuse you, beat you,...
Sometimes google has the answers if not try a website with flashcards
Whos Adolph Hilter?
I only know of a Adolf Hitler
This is true. The annexation was the main cause for the Mexican wars.
