Question: When did it become necessary to have a driver's license?
Disambiguated questions and answers: question: When did it become necessary in Massachusetts  to have a driver's license?
When did it become necessary in Missouri to have a driver's license?
When did it become necessary in Michigan to have a driver's license?
When did it become necessary for commercial drivers in America to have a CDL driver's license?
answer: 1903
1903
1908
1992
Natural Questions answer: 1 January 1904 (from the Wikipedia article "Driver's license")