In Big Bend National Park’s Santa Elena Canyon, the Rio Grande separates the United States (left) from Mexico (right).
Instead of building a wall on the US-Mexico border, a landscape architect calls for restoring the Rio Grande and turning its course into an international park – an idea first proposed in the 1930s.
Former FBI Director James Comey testifies on Capitol Hill in Washington.
AP Photo/Carolyn Kaster
Hoover abused his power as FBI director to serve presidents' interests. The reforms that followed were set up to prevent it from happening again.
President Donald Trump greets Director of the FBI James Comey in January.
Past presidents have made strange requests of the FBI, some of which were documented by J. Edgar Hoover.
Will history give Trump a thumbs-up for his first 100 days?
AP Photo/Luis M. Alvarez
Franklin D. Roosevelt is famous for really getting a lot done fast. Will history remember Trump so kindly?
World War II poster.
U.S. National Archives and Records Administration
Trump's travel ban is an echo of policies passed in the United States during World War II.
Thanks to the US's polarised politics, presidents beloved abroad are controversial at home.
Children bear the brunt.
Children end up caught in the political crossfire.
People carry photos of soldiers who died during the attack on Pearl Harbor.
AP Photo/Andres Kudacki
The Japanese attack on a US naval base on Dec. 7, 1941 set in motion a series of events that transformed the United States into a global superpower. Will Donald Trump bring that era to an end?
A Halloween gathering in Los Angeles for children who live on the street, in shelters or in cars.
On the 20th anniversary of Bill Clinton's promise to "end welfare as we know it," a social work scholar asks why child poverty is still such a problem in the U.S. and what race has to do with it.
A throwback to the Clinton White House?
Jeff Christensen and Shannon Stapleton/Reuters
Hillary Clinton's candidacy has revived an old controversy in a new way: presidential third terms. It is, as one historian explains, a controversy as old as the nation itself.
FDR Presidential Library
Lucky Luciano, Al Capone and FDR walk into a Democratic convention...
Preaching unity in 1948 on the Freedom Train.
US National Archives and Records Administration
Previous efforts to cement national cohesion offer a model but also, says a historian, a warning.
The Lincoln Brigade Memorial in San Francisco.
For many contemporary observers, the Spanish Civil War was seen as very much of a piece with the war against Hitler and Mussolini. But then things changed. Why?
Explaining ‘America First’ on June 7, 2016.
Seventy-five years after it was discredited by an FDR victory and U.S. entry into World War II, the GOP's candidate revives a controversial slogan.
The surprise Republican candidate in 1940: Wendell Willkie.
Library of Congress
He was a former Democrat, a business tycoon and a media star. The story of Wendell Willkie, the Republicans' surprise candidate in the 1940 election and how he disrupted the GOP.
Whose party is it?
When Clinton and Sanders first came of age politically, neither was a natural fit for the Democrats. How they and the party have changed helps explain their philosophical divide today.
Arriving in Lesbos, Greece from Syria.
Afghan, Syrian and Eritrean refugees keep arriving on Europe’s shores, reputedly at an increasing rate. They attempt to traverse the Mediterranean by land and sea, presumably hastened by Putin’s bombing…
Candidates beware! History suggests that book writing presidents are not necessarily the best presidents.
Franklin D. Roosevelt and Winston Churchill are immortalised as political heroes, but both had personal issues that might have proved politically fatal today.
Every culture needs heroes. So when our political system becomes incapable of giving us any, where does that leave us?
FDR gives an address.
The FDR Library
As Jeb Bush, the 11th declared Republican candidate enters the race for president, a look back at a secretive survey in 1935 that foreshadowed today's ubiquitous horserace polls.