Explain how industrialization's problems created the audience for muckraking journalism, and identify the specific reform each muckraker's work provoked.
By 1900 the United States had become the world's leading industrial power, but the numbers hid a rougher reality underneath. Millions of immigrants arriving through Ellis Island crowded into city tenements with no plumbing and little light. Children as young as eight worked in mills and mines. A small number of men -- John D. Rockefeller in oil, Andrew Carnegie in steel -- controlled entire industries through trusts, corporate structures that let one company crush or absorb every competitor. City government was often run by political machines like New York's Tammany Hall, which traded favors and jobs for votes and looked the other way on graft. None of this was hidden, exactly -- it was simply not yet a national story with names, numbers, and photographs attached.
That changed with a group of investigative journalists President Theodore Roosevelt nicknamed "muckrakers" in 1906, borrowing the image of a man so busy raking up muck that he never looks up -- Roosevelt meant it as a half-compliment, half-warning. Jacob Riis's 1890 photo-essay How the Other Half Lives forced middle-class readers to see tenement overcrowding directly. Upton Sinclair's 1906 novel The Jungle exposed brutal conditions for immigrant meatpacking workers -- but readers reacted mainly to his descriptions of diseased meat, which is what actually got regulated. Ida Tarbell spent years documenting, contract by contract, how Standard Oil had illegally crushed its rivals. Each writer aimed a spotlight at one specific problem, and each spotlight was followed, within months or years, by a specific law or court ruling.
Mastery looks like: They can name at least two muckrakers, the specific problem each exposed, and the concrete reform or ruling that followed.
Common stumbles: Assuming exposure automatically causes reform, without noticing the organizing, lobbying, and lawmaking that has to happen in between the two.