African american attorney who fought segregation

Which of the following is one example of an ideological conflict that became one of the causes of world war ii?

How did the construction of the erie canal improve transportation in the united states in the 1820s? a. the canal connected the great lakes to the mississippi river. b. the canal connected the great lakes to the ohio river. c. the canal connected the atlantic and pacific oceans. d. the canal connected the great lakes to the atlantic ocean.

Who was at the top of the feudal system hierarchy