What caused robert e lee to reject an offer to command the union army

a - the union was controlled by president jefferson davis.
b - virginia seceded from the union, joining the confederacy.
c - lee was previously committed to the confederacy.
d - lincoln and lee did not agree on the future of slavery.

Forty years later, the fall of saigon remains a pivotal and emotional event to many. you will now conduct research to find two find two different representations of this historical event. first, you will find an image connected to the fall of saigon. then, you will find a second source of your choosing that represents the same topic