Answer:
The Monroe Doctrine addresses American desires to expand its territory by by stating that the American hemisphere is no longer open to European colonization.
Assuming you're referring to Theodore Roosevelt, one of the most successful things he did in terms of regulating big business was the "break up the trusts,"--in that he took to court companies that were suspected of colluding with other firms and forming monopolies.
I think they are all true but I did this unit a little while ago so I might be wrong