Based on numbers from http://law2.umkc.edu/Faculty/projects/ftrials/shipp/lynchingyear.html http://law2.umkc.edu/Faculty/projects/ftrials/shipp/lynching... lync

Based on numbers from http://law2.umkc.edu/Faculty/projects/ftrials/shipp/lynchingyear.html http://law2.umkc.edu/Faculty/projects/ftrials/shipp/lynching... lynchings dropped off pretty rapidly after 1922, and were in the single digits annually by the mid 1930s. I suspect that there's also a drop in pictures of crowds and a social change that made them considered if not wrong at least "not something that people like US do." There are very few people still alive who were adults when there were large numbers of lynchings happening in the US.