Trump's victory was considered a stunning political upset by most observers, as polls had consistently showed Hillary Clinton with a nationwide—though diminishing—lead, as well as a favorable advantage in most of the competitive states. Trump's support had been modestly underestimated throughout his campaign, and many observers blamed errors in polls, partially attributed to pollsters overestimating Clinton's support among well-educated and nonwhite voters, while underestimating Trump's support among white working-class voters. Actually, the polls were relatively accurate, but media outlets and pundits alike showed overconfidence in a Clinton victory despite a large number of undecided voters and a favorable concentration of Trump's core constituencies in competitive states.
Trump's paternal grandfather, Frederick Trump, first immigrated to the United States in 1885 at the age of 16 and became a citizen in 1892. He amassed a fortune operating boomtown restaurants and boarding houses in the Seattle area and the Klondike region of Canada during its gold rush. On a visit to Kallstadt, he met Elisabeth Christ and married her in 1902. The couple permanently settled in New York in 1905. Frederick died from influenza during the 1918 pandemic.
Trump began his campaign unusually early for an incumbent President of the United States. He began spending for his reelection effort within weeks of his election, and officially filed his campaign with the Federal Elections Commission on the day of his inauguration. Since February 2017, Trump has held several rallies and a fundraiser for this campaign. He has visited key electoral states. The campaign has raised funds and run two nationwide advertising campaigns. The campaign has announced, and Trump has confirmed in several stump speeches, that the slogan for the 2020 race will be changed from "Make America Great Again" to "Keep America Great", once a sufficient level of greatness is reached. As of the fall of 2018, Trump continues to use the old slogan.