Answer: Russia's over 23 million privately held serfs were freed from their lords by an edict of Alexander II in 1861
Answer:
African participation in the slave trade
Africans played a direct role in the slave trade, selling their captives or prisoners of war to European buyers. The prisoners and captives who were sold were usually from neighbouring or enemy ethnic groups.
Answer:
beam balance and standard masses
Ww1 ended in 1920. Also, America was then the new worlds superpower.
The united states emerged as a great industrial power