How To Write A 19Th Century Letter . The same rule about capitalization applies to decades as to centuries: Paris to london, 1792 ( letter 1) paris to london, 1792 ( letter 2) york & somerset heralds die in crush: How to Write Letters A 19thCentury Guide to the Lost Art of from www.pinterest.com Since the years of the nineteenth century begin with the numerals “18,” it is also called the “1800s” (pronounced eighteen hundreds ). First, to have something to say; “all women were oppressed in the 19th century”.