Loving hate, heavy lightness, cold fire, and sick health are all examples of oxymoron.
The did enter Africa for their own personal gain yes i dont not believe that powerful countries should be allowed to enter weaker countries because they can take what little they do have and steal it to make them more powerful.An example would have been the British because they went and tried to take over other countries.
True, its always good to know important dates about anything, especially if it could be on a test.
I’d go with “Lonely and homesick for his village and friends in Mexico”