The invention of electric streetcars, commuter trains, and subways in the late 1800s a. affected only rural regions
b. spurred the growth of suburbs
c. had little effect on American society
d. disrupted traffic in downtown areas

Over time, historians have changed the ways they study the past because they have: o a. emphasized the study of oral history passed down in communities for generations. o b. started to explore history through the perspectives of many different groups. c. focused on uncovering archaeological evidence rather than analyzing documents. d. largely abandoned studying comparative and cultural history in favor of microhistory.