In which era did these occur: Sharecropping, Black Codes, Freedman's Bureau, Military Reconstruction Acts?

Me < 3 there are multiple ‘3rd party’ political parties in the us. what are the benefits of having 3rd parties? what are the disadvantages of being a member of one? would the u. s. benefit if there were more 3rd parties created, more support for the current ones, or would it be best to get rid of them altogether? why?

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

How are the republican and democratic presidential candidates chosen? a. they are nominated by their state governments. b. each is nominated by his or her respective party. c. each is chosen by the governor of his or her home state. d. they are chosen by the house of representatives.