Question: When did country where the birthplace of Daniel Agnew is found, begin the census?

full_context: Document 1: Daniel Pipes: The son of Irene (née Roth) and Richard Pipes, Daniel Pipes was born in Boston, Massachusetts, in 1949. His parents had each fled German-occupied Poland with their families, and they met in the United States. His father, Richard Pipes, was a historian at Harvard University, specializing in Russia, and Daniel Pipes grew up primarily in the Cambridge, Massachusetts area.
Document 2: Aamer Anwar: Anwar was born in England and moved to Scotland in 1986 to study mechanical engineering at the University of Glasgow for a future in the Royal Air Force. He became a student activist and led a campaign against alleged racism at the city's Dental Hospital. This eventually saw the introduction of anonymous marking across all faculties at the University.
Document 3: Medina Independent School District: Medina Independent School District is a public school district based in the community of Medina, Texas (USA). Located in Bandera County, a small portion of the district extends into Kerr County.
Document 4: Centerville Independent School District (Trinity County, Texas): Centerville Independent School District is a public school district located in Trinity County, Texas, USA. It is a small school with an attendance of fewer than 175 students.
Document 5: Daniel Agnew: Agnew was born at Trenton, New Jersey on January 5, 1809, and was of Irish/Welsh heritage. His father was a Princeton-educated doctor; his mother was part of the Howell family that was prominent in New Jersey affairs of that era. The family moved to Pittsburgh, when Agnew was about four years old. Agnew grew up there, attended the Western University of Pennsylvania (now the University of Pittsburgh), and then studied law with two experienced attorneys. He was admitted to the bar in 1829, at age 20 and began practicing law.
Document 6: O'Donnell Independent School District: O'Donnell Independent School District is a public school district based in O'Donnell, Texas (USA). Located in Lynn County, portions of the district extend into Dawson and Terry counties.
Document 7: Race and ethnicity in the United States Census: Race was asked differently in the Census 2000 in several other ways than previously. Most significantly, respondents were given the option of selecting one or more race categories to indicate racial identities. Data show that nearly seven million Americans identified as members of two or more races. Because of these changes, the Census 2000 data on race are not directly comparable with data from the 1990 census or earlier censuses. Use of caution is therefore recommended when interpreting changes in the racial composition of the US population over time.
Document 8: Race and ethnicity in the United States Census: The biggest change in this year's census was in racial classification. Enumerators were instructed to no longer use the "Mulatto" classification. Instead, they were given special instructions for reporting the race of interracial persons. A person with both white and black ancestry (termed "blood") was to be recorded as "Negro," no matter the fraction of that lineage (the "one-drop rule"). A person of mixed black and American Indian ancestry was also to be recorded as "Neg" (for "Negro") unless he was considered to be "predominantly" American Indian and accepted as such within the community. A person with both White and American Indian ancestry was to be recorded as an Indian, unless his American Indian ancestry was small, and he was accepted as white within the community. In all situations in which a person had White and some other racial ancestry, he was to be reported as that other race. Persons who had minority interracial ancestry were to be reported as the race of their father.
Document 9: Multiracial Americans: Colonial records of French and Spanish slave ships and sales, and plantation records in all the former colonies, often have much more information about slaves, from which researchers are reconstructing slave family histories. Genealogists have begun to find plantation records, court records, land deeds and other sources to trace African-American families and individuals before 1870. As slaves were generally forbidden to learn to read and write, black families passed along oral histories, which have had great persistence. Similarly, Native Americans did not generally learn to read and write English, although some did in the nineteenth century. Until 1930, census enumerators used the terms free people of color and mulatto to classify people of apparent mixed race. When those terms were dropped, as a result of the lobbying by the Southern Congressional bloc, the Census Bureau used only the binary classifications of black or white, as was typical in segregated southern states.
Document 10: James Carnahan: Born in Cumberland County, Pennsylvania, Carnahan was an 1800 graduate of the school when it was called College of New Jersey. He held positions at churches in New Jersey and New York until moving to Georgetown, District of Columbia in 1814 to teach school for nine years.
Document 11: Trenton Independent School District: Trenton Independent School District is a public school district based in Trenton, Texas (USA). The district serves students in southwest Fannin County.
Document 12: Race and ethnicity in the United States Census: The 1850 census saw a dramatic shift in the way information about residents was collected. For the first time, free persons were listed individually instead of by head of household. There were two questionnaires: one for free inhabitants and one for slaves. The question on the free inhabitants schedule about color was a column that was to be left blank if a person was white, marked "B" if a person was black, and marked "M" if a person was mulatto. Slaves were listed by owner, and classified by gender and age, not individually, and the question about color was a column that was to be marked with a "B" if the slave was black and an "M" if mulatto.
Document 13: Multiracial Americans: In 1790, the first federal population census was taken in the United States. Enumerators were instructed to classify free residents as white or "other." Only the heads of households were identified by name in the federal census until 1850. Native Americans were included among "Other;" in later censuses, they were included as "Free people of color" if they were not living on Indian reservations. Slaves were counted separately from free persons in all the censuses until the Civil War and end of slavery. In later censuses, people of African descent were classified by appearance as mulatto (which recognized visible European ancestry in addition to African) or black.
Document 14: Blanco Independent School District: Blanco Independent School District is a public school district based in Blanco, Texas (USA). Located in Blanco County, portions of the district extend into Kendall and Hays counties.
Document 15: Daniel A. Whelton: Born in Boston to Irish (County Cork) natives Daniel and Ann Curry Whelton, he lived in Boston's West End at 69 Billerica Street. When he was five years old, Whelton's father died and he was raised by his mother, who worked as a pastry cook for the admiral commanding the Charlestown Navy Yard. Whelton received his education at St. Mary's School, graduating in 1886. After Whelton graduated from St. Mary's, Whelton attended the Evening High School for a few months.
ground_truth: 1790
sub_queries: Daniel Agnew >> place of birth Answer: Trenton
Trenton >> country Answer: US
When did the US begin to take census? Answer: 1790