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"...Measles was declared eliminated (absence of continuous disease transmission for greater than 12 months) from the United States in 2000. ..."

Measles History from the CDC: https://www.cdc.gov/measles/about/history.html

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This is some shady definition. There were outbreaks in 1999, so really what does "eliminated" mean? To me it has never been "eliminated".

https://www.cdc.gov/mmwr/preview/mmwrhtml/mm4925a1.htm

The CDC page he linked to defines "eliminated", as does his comment: "absence of continuous disease transmission for greater than 12 months". You can have outbreaks of a disease that have been eliminated from a population: the disease can be reintroduced from some other population. But what you don't have is person-to-person transmission within the population.

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