Interested in exploring the census further in the classroom? Teachinghistory.org's Lesson Plan Review The First Census: America in 1790 leads students to examine census data for insights into the politics behind the Great Compromise and the Three Fifths Compromise at the Constitutional Convention of 1787.

Don't be turned away by its long name—the Selected Historical Decennial Census Population and Housing Counts website houses more than 21 historical census reports and the history of each U.S. census taken. The United States Census Bureau, of course, also provides a wealth of census data and tools for accessing and assessing the data. And for census data stretching from 1790 to 1960, try the University of Virginia's United States Historical Census Data Browser.

[Question 1] The first photograph of either a president or a first lady broadcasting from the White House is of Mrs. Hoover. She began national broadcasts in 1929, even setting up a practice room in the White House where she could "improve [her] talkie technique." Many of her broadcasts were made from President Hoover's country retreat, Camp Rapidan, where she often devoted her programs to speaking to young people, urging girls to contemplate independent careers and boys to help with the housework. Mrs. Hoover had a degree in geology from Stanford University, as did her husband. She had accompanied him to China for two years, where he hadsupervised the country's mining projects. She later used the Mandarin Chinese she learned then to communicate with her husband privately when they were in the presence of others.

[Question 2] Her father and her maternal grandfather had both served in Congress. When she was 17, she had gone to Washington with her parents to visit their family friends, President Rutherford Hayes and his wife Lucy, and she had spent a week as a guest at the White House. She was politically ambitious, but saw little opportunity for women to advance their own political careers. She married William Taft, a lawyer, who would probably have been content to practice law, or to become a judge, but she strongly encouraged him to accept political appointments, and finally, to run for political office. On her husband's inauguration day, the outgoing President, Theodore Roosevelt, left Washington immediately after the swearing-in ceremony, and she skillfully maneuvered herself into the car, next to her husband, that drove them both back to the White House. William Taft coped with stress and unhappiness by eating. During his presidency, his weight ballooned to 340 pounds, making it necessary for theTafts to replace the White House bathtub with a super-sized one.

[Question 3] Bachelor President Grover Cleveland married 21-year-old Frances Folsom on June 2, 1886, in a White House ceremony at which John Philip Sousa played the wedding march. After the ceremony, the newlyweds escaped to a honeymoon cottage in nearby Deer Park, Maryland, where reporters camped out in the bushes. Frances Folsom was the daughter of Cleveland's former law partner. Cleveland had known her since she had been born, and had bought her first baby carriage. He was 27 years older than her.

President John Tyler's first wife, Letitia, was the first woman to die during her husband's presidency, in 1842. He remarried while he was President, to Julia Gardiner, at her church in New York City, on June 26, 1844. President Wilson's first wife, Ellen, died in the White House on August 6, 1914, and he remarried, to Edith Bolling Galt, while he was President, on December 8, 1915, in a ceremony at Edith's Washington, D.C. home.

[Question 4] Julia Grant, although it happened after her husband was no longer president. Mrs. Grant went down the Big Bonanza silver mine in Virginia City, Nevada with her husband after hearing that he had wagered that she would be afraid to go. The Grants, along with their son, Ulysses, Jr., visited the mine on October 28, 1879, more than two years after Grant had left office. The mine's fabulous production of silver during the Civil War had done much to undergird the Government's financial credit internationally. Lucy Hayes later descended into the same mine with her husband, President Rutherford Hayes. On May 21, 1935, Eleanor Roosevelt made the national news by visiting the Willow Grove coal mine in Bellaire, Ohio, to observe the working conditions of the miners.

[Question 5] After the Lincolns' son Willie died in February 1862, she grew despondent. A few of her acquaintances suggested that she and her husband could still receive consolation from him in the afterlife through the intermediary of a spirit medium. Mrs. Lincoln invited several—the exact number is disputed—to the White House for private consultations. Both Lincolns attended a few séances elsewhere in Washington, although it is a matter of conjecture whether the President regarded these as anything more than a kind of entertainment.

[Question 6] The famous writer was Washington Irving. James Madison was generally shy and reticent among crowds and at parties, but Dolley was a social gadfly and an accomplished hostess. She was also a couple of inches taller than her husband.

[Question 7] Lyndon Johnson, with his wife Lady Bird on one side and Jackie on the other, was sworn in aboard Air Force One less than two hours after JFK's assassination. The ceremony was delayed to wait for Jackie to arrive. The most famous photograph of the event has Jackie in the foreground, standing in a pink suit still stained with her husband's blood, with LBJ in the center with his hand upraised taking the oath, and with Lady Bird in the background.

The University of Georgia's Center for Invasive Species and Ecosystem Health lists invasive species—plants, animals, insects, and others—in the U.S. today. It does not, however, describe the history of most invasions—a classroom exercise might involve students selecting a species from the list and tracing its introduction to the U.S. through research elsewhere. For instance, the New York Times' archived articles include an 1877 article on the American Acclimatization Society's release of sparrows, skylarks, and other birds in North America.

Try a general search of NHEC using the keywords "Civilian Conservation Corps" to learn more about the history and activities of this New Deal organization.

For websites offering primary sources and high-quality information on the environment, conservation, and other ecology-related topics in U.S. history, search NHEC's Website Reviews—Topic: Environment and Conservation. Or search Online History Lectures using the same topic to turn up audiovisual presentations, long and short, on nature and U.S. history.