Ramba uchinyora ndima iyi - Somumwe wevarume vokuAmerica vakamhanyisa mamita 4×200, akahwina menduru yendarira muna 1908 uye menduru yesirivha muna 1912; muna 1912 akahwinawo mujaho wokumhanya kumashure kwemamita 100. Mumakwikwi emamita 100 akasununguka, akabviswa mumasemi-fainari muna 1908, uye mumutambo wokutanga
muna 1912. Muna 1920 akanga ari nhengo yechikwata chechina cheAmerica chemvura yepolo.