Dallas (CNN) -- Some may disagree whether George W. Bush was a "uniter, not a divider," as he liked to say, but he did get all five living presidents together for the dedication of his presidential library.
At Thursday's event in Dallas, Democratic former Presidents Jimmy Carter and Bill Clinton praised Bush for his initiatives in Africa, and Bush defended his record.
"The political winds blow left and right, polls rise and fall, supporters come and go, but in the end, leaders are defined by the convictions they hold," Bush said at the ceremony for the George W. Bush Presidential Center. "My deepest conviction, the guiding principle of the administration, is that the United States of America must strive to expand the reach of freedom."
Bush has said he is aware that the opening of his presidential library would reopen debates over the Iraq War and the policies he pursued after the September 11 terrorist attacks. History will show, he said at the dedication, that he always stuck by his convictions.
"A free society thrives when neighbors help neighbors and the strong protect the weak and public policies promote private compassion," Bush said. "As president, I tried to act on these principles every day. It wasn't always easy and certainly wasn't always popular ... but when future generations come to this library to study this administration, they're going to find out that we stayed true to our convictions."
Carter told a story of how he asked, on Bush's inauguration day, for a meeting to talk about a civil war in Sudan that was entering its second decade. Bush kept his word and acted, Carter said.
"In January of 2005, there was a peace treaty between north and south Sudan that ended a war that had been going on for 20 years," Carter said. "George W. Bush is responsible for that."
The last time the five living presidents were together was right before President Obama took office. It is a rare and special occurrence when the five gather, Obama said.
"This is a Texas-sized party," Obama said. "When all the former living presidents are all together, it is a special day for our democracy."
The presidents on the stage definitely differed on many policy matters, but they all share one quality, Obama said: They did what they believe is right.
"That's what President George W. Bush chose to do," Obama said.
Bush became a little emotional as he closed his speech: "Whatever challenges come before us, I will always believe our nation's best days lie ahead."
The center's library and museum take visitors through the turning points of Bush's two terms. The first exhibits recall the 43rd president's initial priorities on education, faith-based community initiatives and tax cuts. And they show how the September 11 terrorist attacks changed everything.
At one exhibit, the bright red dress that first lady Laura Bush wore to her husband's first state dinner, just six days before 9/11, stands in contrast to the next, most talked-about artifact in the museum: the twisted hulk of two beams from the World Trade Center.
In an interview with CNN's John King, the former president said he knows that the center's dedication will rekindle the debate about his presidency, and he conceded the library is in part an effort by him and supporters to influence history's verdict.
But he predicted visitors would find it "more objective" than they might have imagined, and he showed little interest in revisiting flashpoints like Iraq, Hurricane Katrina or the 2008 financial crisis, or the scorn with which many look back at the Bush presidency.
"You know, I'm really not that concerned about why people did what during my presidency," he said. "I'm more concerned about being an effective person for the rest of my life.
"I know this: that Laura and I gave the presidency eight years of our life. We gave it our all. Made the best judgment calls I could. I didn't compromise my principles. And I'm a content man. And I am excited about what we're going to do here."
As the son of another former president, Bush said he wouldn't mind seeing his brother Jeb Bush run for the highest office.
If he could make the decision for Jeb, he would tell him to run for president, Bush said.
But in an interview Thursday on NBC's "Today," former first lady Barbara Bush said that while Jeb Bush is able to do the job, she would like to see other families in the White House.
"There are other people out there that are very qualified, and we've had enough Bushes," she said.
In addition to the library and museum, the Presidential Center includes the George W. Bush Institute, a public policy institute.
CNN's Mariano Castillo wrote and reported this story in Atlanta. CNN's John King and Brianna Keilar contributed from Dallas.