What is the difference between a historical account and a narrative poem?

Henry Wadsworth Longfellow was one of the most popular poets in American history. He wrote Paul Revere’s Ride in 1860, 95 years after the actual ride. Current events at the time influenced Longfellow’s approach to his famous poem. During that time the Independence war was receding from memory and the civil unrest which lead to the American Civil War was beginning. A critical time in American history had started, a time in need of patriotism, when a unifying cause was needed to avoid the break up of the Union. The author's intentions were political, he wanted to remind his readers of the sacrifices their parents went through and to build awareness to fight slavery and protect the Union. To appeal his audience he combined narrative fiction with the music of verse. Longfellow romanticized his character to inspire and lift spirits.

one context clue that me find the meaning of luxuriance was that the base word of luxuriance is luxury, so i think that luxuriance means something that is luxury, or something luxurious.