Historians use terms such as a. d., b. c., decade, and century
a. to us locate ourselves in space.
b. to refer to periods of time.
c. to define the term odyssey.
d. to identify ancient civilizations.

the answer is: the sesquicentennial of the american civil war is an occasion to consider the legacy of that great conflict. this legacy is our inheritance, and despite many indelible features, we continue to negotiate the resolution of that conflict. the civil war was fought over slavery, but not always on behalf of slaves

an earnest tone.

because portia wants to know why brutus has been acting strange lately.