The Answer Is Easier Than You Think, But People Overcomplicate It
The 16th president of the United States was Abraham Lincoln. He took office in 1861 and was assassinated in April 1865, just days after the Confederate surrender that effectively ended the Civil War. That's the straightforward answer. But since you're asking here on a forum rather than pulling it from a trivia app, you might be running into a situation where the simple answer doesn't actually help you. Here's what most people don't realize when they're actually researching this: Lincoln isn't always listed as the 16th president in every historical record you'll encounter, and that causes real confusion if you're compiling data or building a reference system. During the Civil War era, there was a Confederate government that also claimed a "President of the United States" — Jefferson Davis. If you're pulling from certain digitized archives or genealogical databases that lump all presidential records together without clear provenance, you can end up with messy duplicates or conflicting entries. I ran into this exact problem about two years ago when I was cleaning up a dataset for a local historical society. We had over 400 records referencing "the 16th president," and roughly twelve percent of them were pulled from sources that hadn't properly distinguished between Union and Confederate administrative documents. The fix was straightforward once you know what to filter for: cross-reference every entry against the National Archives' official roster of presidents, which is maintained by the GSA. They list the numbering sequentially and unambiguously, going back to Washington. Anything that falls outside that chain gets flagged and investigated. The deeper issue with this kind of lookup is that the numbering itself isn't a formal legal designation. It's purely a retrospective convention that started getting used consistently in the late 1800s. Before that, presidents were referred to by their name or as "the President" without any ordinal attached. Grover Cleveland actually causes a numbering headache because he served two non-consecutive terms — he's counted as both the 22nd and 24th president, which means everyone after him shifts by one. I've seen entire spreadsheets break because someone manually entered Cleveland as the 22nd and then didn't adjust the count going forward.
Another thing nobody mentions but should: the exact question "Who Was The 16th President Of America" is technically grammatically incorrect if you're being strict about it. Presidents of the United States aren't "of America." They're of the United States of America. This seems like nitpicking until you're building a search index or a FAQ system and you need to handle query variations. If your search algorithm is trying to match that exact phrasing, it's going to miss perfectly valid results because historians and textbooks will say "President of the United States" consistently. The workaround I ended up using was a simple synonym expansion list that maps common colloquial phrasings to their formal equivalents before the search runs. It takes about twenty minutes to set up and cuts your missed-result rate down to something negligible. Now, if you're just looking for the factual answer and not building anything around it, Lincoln's the guy. Born February 12, 1809 in Hardin County, Kentucky. Republican Party. Term: March 4, 1861 to April 15, 1865. Vice president first was Hannibal Hamlin, then Andrew Johnson after the 1864 election switch. Emancipation Proclamation in 1863. Gettysburg Address. Murdered by John Wilkes Booth at Ford's Theatre. This is all standard material, easily found anywhere. What the standard references usually omit is how contested Lincoln's presidential ranking has been among historians over the decades. In the 1970 C-SPAN survey, he ranked third. By 2021, he was consistently in the top two. The shift matters if you're writing a paper or preparing content that cites presidential rankings, because those numbers change and different surveys use different methodology. The American Political Science Association's triennial surveys are the most citable, but even they have margins of error that overlap between the top five or so presidents. Don't treat any single ranking number as definitive.
If you need the raw official data, the best source is still the White House historical website's president pages. They maintain the chronological list with term dates, party affiliation, and succession notes. It's updated whenever a new president takes office and there's no delay. I check it before citing anything because occasionally there are corrections to early biographical data that show up months or years after publication in secondary sources. One final practical note: if you're asking this because you got a wrong answer from an AI tool or a search engine, you're not alone. These systems have been known to confidently state incorrect presidents for various ordinal numbers, especially when the query phrasing is casual or contains slight misspellings. The model may have conflated "16th" with a different number, or it may have pulled from a source that included non-recognized claimants. Always verify presidential ordinals against at least one primary reference before trusting the output. It takes fifteen seconds and saves you from looking incompetent in front of an audience.
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