Which of the following makes a true statement? the 1960 census revealed that the u. s. population had just passed the 200 million mark and was the first to ask questions about ethnic background. the 1960 census revealed that the u. s. population had just passed the 300 million mark and was the first to ask questions about ethnic background. the 1970 census revealed that the u. s. population had just passed the 200 million mark and was the first to use computer tape for data collection. the 1970 census revealed that the u. s. population had just passed the 300 million mark and was the f