World war 1 began on 28 July 1914 and ended on 11 November 1918, so the years when WW1 lasted were 1914, 1915, 1916, 1917, 1918 it lasted exactly 4 years 3 months and 2 weeks :)
For forgiveness and peace because he's ashamed
Thomas Jefferson is the person who made that statement at his inaugural address in 1801.
