Which of the following northern groups supported the south in it's resistance to abolition

Which of the following statements is true about germany's use of u-boats?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Which one of these were common aspects of war efforts during world war 1 1. rationing 2. war bonds 3. using schools as military facilities 4. child soldiers 5. women working in factories circle all that apply