"In the pre-vaccine era in the United States, an estimated three to four million cases of measles occurred annually, and approximately 500,000 cases and 500 deaths were reported annually, with epidemic cycles every two to three years."
Compare that to the number of measles cases occurring during more recent years, when children have been protected by vaccines. According to this report, during one recent period (1997-2001) there was a total of only 540 measles cases, and most of those were in people who came to the U.S. from other countries.
So measles cases have been reduced from half a million cases a year to about 100 per year thanks to immunization, and deaths from measles are now a rarity.