I think it's the second one
At no point in recent history have calls for Africa to industrialize been stronger than they have been lately. Across the continent, industrialization is arguably the most talked about subject among policymakers. So why has action on the ground failed to move the needle on this important development marker?
Tone is the attitude writers express through words they choose. Note that mood is the specific feelings that the reader gets from the authors text. The tone of Lincolns speech is sorrowful for the lost soldiers and determined to persuade his audience to take action.