On July 13, 1929, in North Platte, Nebraska, white police officer Ed Green told Louis Seeman, a Black resident of the town who was either 30 or 35 years old, that he was a public nuisance and ordered him to leave. Seeman drew a pistol, shot Green, and killed him. Crowds quickly formed in response and demanded that all Black residents of the town leave by 3 o'clock that day. These crowds grew into mobs of roughly 500 people who, together with police, sought to locate Seeman, who had hidden in a chicken coop. The mob poured gasoline on the coop and set it on fire. Seeman died of a gunshot wound during this encounter; it was officially reported as suicide, though Jim Griffin of the Lincoln County Historical Museum has described it as a lynching. Members of the armed mob shouted phrases including "lynch them all" and "run them out of town," and reportedly manhandled Black residents throughout the town.
Following the mob's formation, North Platte's Black population left the town, with some departing on foot and unable to retrieve their belongings. Contemporaneous news sources, corroborated later by historian David G. Dales, reported that residents faced death threats if they remained, although a subsequent state investigation could not substantiate claims of physical violence. Police chief James Dorran said protection for returning Black residents "may not be possible," while state sheriff William Condit said he would not intervene unless requested, and remarked that Black residents "are better off in leaving for the time being."
By July 15, 1929, Nebraska governor Arthur Weaver demanded that Black residents be permitted to safely return to North Platte. Attorney General Christian A. Sorensen opened an investigation into the unrest, stating he would "prosecute the case to the limit." Both officials indicated intent to prosecute mob members responsible for driving out the town's Black population.
Sources disagree on how many Black residents lived in North Platte before the expulsion: a contemporaneous news report placed the number at around 200, while Dales estimated it at a few dozen.
By August 1929, at least four North Platte residents faced trial on charges of "unlawful assembly." Three were acquitted after a jury deliberated for ten minutes. The state did not pursue further prosecutions related to the exodus. Black community leaders in Omaha described the events as among the most serious attacks on Black people in the northern United States at the time. Historian David G. Dales characterized the killings of both Green and Seeman as brutal and the expulsion as "an act of force," while stating that he did not consider the exodus to constitute a race riot.