The year that the U.S. Poverty line calculation was developed and began to be used was 1964.
In the year 1964, the Council of Economic Advisers (CEA) came up with an amount of $3,000 for the poverty line.
The Council recommended to President Johnson that any family earning below this amount in a year should be considered poor.
Find out more on the poverty line at https://brainly.com/question/13522306.