Identify and describe four factors that led to a greater movement of pioneers to oregon country during the 1840s.

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.