Roosevelt's policies were aiming toward progressive and popular ideas, aiming toward breaking up monopolies. He wanted to make the lives of ordinary people better.
Right down points you are going to make in the discussion, followed with a reason on why you feel those points are necessary
They got some land from the Louisiana Purchase and other land they got from Mexico through the 1848 Treaty of Guadalupe Hidalgo.
I believe it was slaves. From what I know, slaves were widespread all over Africa. I hope I helped.
