On what did the german military strategy of the blitzkrieg depend?
a. a system of trenches and fortifications
b. digging in and waiting out the enemy
c. surprise attacks with overwhelming force
d. the ability to make long, steady advances

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.