Translation of tono

The machine arrived in Cuba at nine and it was already dark. The border control was nothing like the one in Mexico. They were communist and one could see the strictness and uneasiness of them.
Unfortunately, it is a natural and eternal phenomenon of human beings. Whereever people have been, it appeared too. Please let me define racism in my next email to you and please share also your thoughts.
We left and went back to the boat which took us back to the big vessel. We started our journey back to the main land. It was already late and from the main land, it was still a four hour drive back.