By 1914,
Venustiano Carranza had been sworn into office as Mexico's head of state ending the main fighting of the
Mexican Revolution. U.S. President
Woodrow Wilson, tired of the fighting and being more concerned with events unfolding in Europe and
World War I, withdrew American forces from Mexico. Mexican revolutionary
Pancho Villa refused to give up the fight and continued to execute border skirmishes. Between 1915 and 1917,
typhus (which was sometimes reported as
typhoid fever) spread from
Mexico City to the provinces from
Veracruz to
Jalisco. In September 1916, Carranza called for a constitutional convention to end the conflict and bring peace to Mexico. The convention ended simultaneously with the end of the riots, on January 31, 1917, and subsequently the
new constitution was signed on February 5. During the same period,
Thomas Calloway Lea Jr. was elected as the mayor of
El Paso, Texas. Lea sent telegrams to
U.S. Senators in
Washington demanding a
quarantine be put in place to stem the tide of "dirty lousey destitute Mexicans" who would spread typhus into El Paso. The
Public Health Service Officer for El Paso, Dr. B. J. Lloyd, admitted there was little danger and opposed a quarantine, but suggested opening de-lousing plants. U.S. officials quickly adopted a policy of
sanitizing Mexican immigrants at a disinfecting station in El Paso. The policy initially applied to all Mexicans entering the United States at El Paso, but soon spread to the
Laredo–Nuevo Laredo crossing, and eventually along the entire U.S. Mexico border. Men were separated from women and children into separate buildings, where they were stripped of all clothing and valuables. Most clothing and valuables were steamed. Other items which might be damaged by steam (like shoes, hats, or belts) were exposed to
cyanogen gas. Attendants examined the nude people for
lice. The officers conducting the strip searches were rumored to have photographed the nude women and shared the photos to others at bars. When lice were found on a man, the man's hair was clipped close to his head and the clippings were burned. For a woman, the hair was doused in a mixture of
vinegar and
kerosene, wrapped in a towel, and left on the hair for at least 30 minutes. If lice were found on re-inspection, the process was repeated. Once attendants declared the lice test had been "passed", the naked people were gathered in a bathing area and sprayed with a liquid soap made of soap chips and kerosene oil. After collecting their sanitized clothing and dressing, migrants were evaluated by a foreman, vaccinated and given a certificate that they had completed the procedure. From the disinfecting area, migrants then entered the Immigration and Naturalization Service building for processing. ==Riot==