1790 - No.
1800 - No, again.
1810 - Still no.
1820 - Yes it was added.
1830 - Still there.
1840 - Removed.
1850 - Nope.
1860 - No.
1870 - Only asked for males aged 21 or older.
1880 - Only males aged 21 or older again.
1890 - Yes, in some form of question.
1900 - Yes.
1910 - Yes.
1920 - Yes.
1930 - Yes.
1940 - Yes.
1950 - Yes.
1960 - No. But place of birth was asked.
1970 - Only on the long form (1/6th of Americans), not the short form (rest of America).
1980 - Long form only.
1990 - Long form only.
2000 - Long form only.
2010 - Short form only was mailed to all Americans, and the long form questionnaire was eliminated. But, the "American Community Survey," which is continually sent to randomly selected Americans every year has contained the question since its inception.
2020 - Trump is trying to add citizenship to the short form, despite the census department collecting better/recent data every year.
But yes, it's always been on the Census, so why let facts get in the way?