When Europeans settlers came to the Americans, Native Americans were treated very poorly. They often became slaves, subjected to harsh treatments that could cause death. Many of them also got infected by diseases for which they did not have antibodies, leading to millions of deaths.
These conditions made some Europeans uncomfortable, particularly missionaries. They argued for better treatment of the Native Americas, specially Spanish missionary Bartolomé de las Casas. For this reason, the Spanish crown forbade Native American slavery. However, they were still oppressed by other forms of work that were very much like slavery.
I really think Marcel Duchamp created that artwork because his art work is something like that, and is closer then all the other artists you have listed.
Roosevelt states that the United States are there to free the Filipino people who have been oppressed, even going as far as to claim that they've never dreamed of having such freedom, while Mark Twain claims that they will only subjugate and oppress the Filipino people themselves.
The President is elected by members of an electoral college consisting of elected members of both Houses of Parliament and Legislative Assemblies of the states in accordance with the system of proportional representation, by means of single transferable vote.
