“If there is anyone out there who still doubts that America…

“If there is anyone out there who still doubts that America is a place where all things are possible, who still wonders if the dream of our founders is alive in our time, who still questions the power of our democracy, tonight is your answer.”—Barack Obama   President Obama spoke these words …

“For the families of the seven, we cannot bear, as you do, t…

“For the families of the seven, we cannot bear, as you do, the full impact of this tragedy. But we feel the loss, and we’re thinking about you so very much. Your loved ones were daring and brave, and they had that special grace, that special spirit that says, ‘give me a challenge and I’ll meet it with joy.’ They had a hunger to explore the universe and discover its truths. They wished to serve, and they did. They served all of us.”—Ronald Reagan, January 28, 1986   In this speech, President Reagan was most likely speaking about which tragic event?