Which statement best explains why the transcontinental railroad took several years to build?

Who was pancho villa? a u.s general who led american troops into mexico an american expert on tropical diseases a mexican rebel who attacked and burned a town in new mexico a leader of a hostile revolt in panama

In the mid-1800s, how did american indians often react to the us government signing treaties with tribal chiefs to establish reservations? many american indians did not accept the treaties and resisted relocating. many american indians fought for land taken away by the dawes act. many american indians bought land in oklahoma from white settlers. many american indians accepted the treaties and relocated voluntarily.

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment