Question: Where was the first mcdonald's built in the usa?
Disambiguated questions and answers: question: Where was the first restaurant the McDonald family opened in the US?
Where was the first restaurant the McDonald family opened in the US that was simply called "McDonald's"?
answer: Huntington Drive (Route 66) near the Monrovia Airport
Monrovia, California
adjacent to the Monrovia Airport
West 14th and 1398 North E Streets in San Bernardino, California
San Bernardino, California
Natural Questions answer: December 12 , 1948 (from the Wikipedia article "History of McDonald's")