In which way was the distinction "serf" different from that of "slave"?

Which of these resulted in an actual slow down or limiting of the u.s. and soviet nuclear arsenals?

Explain the reasons for u.s. neutrality during the 1920s and 1930s. how did ideas about neutrality change during the period from the end of world war i to the passage of the lend-lease act? be sure to include any events, terms, or people that may support your response.

Which of the following does not describe europe after that fall of the western roman empireh