With second inaugural address, Trump gets another chance to make history

Presidential inaugural addresses often contain memorable lines, but many are forgotten. Notable speeches include those by FDR, JFK, and Reagan, who addressed significant challenges. Recent presidents like Bush and Obama are remembered more for informal remarks. Trump's inaugural speech is noted for its tone rather than content. The true impact of such speeches is often realized over time, as seen with FDR and Reagan.

What themes did Steve Groves suggest Trump might focus on in his next inaugural address?

Why is it said that the true impact of presidential speeches may not be known for years?