Why did Robert E. Lee turn down the offer to comand the Union army?

Approximately how many americans, from both the north and the south, were killed in battle during the civil war?

Which two sentences in this passage talk about china’s efforts to curb environmental degradation?

Which were the most important issues during the presidential election of 2008? a.economic downturn and environmental protection b.two overseas wars and economic downturn c.two overseas wars and campaign spending d.environmental protection and campaign spending