Former President Donald J. Trump’s penchant for fabrication and hyperbole has long been a core tenet of his bombastic persona and political messaging. Two campaigns, one term in the Oval Office and eight years later, Mr. Trump has loosened his grasp on the facts even more.A comparison of his addresses before the Republican National Convention in 2016 and 2024 demonstrates how his relationship to the truth has changed, offering a glimpse of how he will likely cast himself on the campaign trail as he seeks to reclaim the White House.In 2016, when he accepted the nomination after a bitter primary...