It's began with the Spanish American war
I believe the answer is Jews
Answer:
The Mexican government had not kept its
promise to protect their rights. I think it's this one.
Well they both helped to modernize/industrialize the U.S, so it depends which view point you would like to take. They stole the plans from england, who had successfully monopolized industrialization for almost a century, who would be upset at this loss of control and therefore business. However an American would probably be thankful for the industry that blossomed as a result of these actions.
Stalin unified the Soviet Union after the death of Lenin, although it should be noted that this "unification process" involved mass killings and deportations of people Stalin deemed to be enemies of the state.
