started backing his opponents during the civil war. >> after 6 years of pancho villa being the friend of the united states, he got angry with the united states because he said that he was betrayed by the states. >> pancho felt betrayed and launched an attack in 1916. >> he went into columbus, new mexico, and attacked the whole town. and that was considered the only invasion the united states ever had in the whole history of the united states. >> the united states sent general john pershing to hunt pancho down and bring him back dead or alive. but he never found him. villa retired in 1920, but in 1923, he decided to get back into politics, and as a result was assassinated. >> so this is the car that he was driving when he was killed. his secretary was on the right-hand side, and 4 of his guards were in the back. >> right. >> they got shots from all over. pancho villa got 16 shots. >> and who killed him? >> nobody knows officially, but the government was involved in the assassination. he was 45 years old when he was killed. >> wow. very young. so this, it looks like, is pancho villa's h