LÃ zaro CÃ rdenas del RÃ o ( Jiquilpan , MichoacÃ n , May 21 , 1895 - October 19 , 1970 ) was president of Mexico from 1934 and 1940 . LÃ zaro CÃ rdenas del RÃ o ( May 21 , 1895 - October 19 , 1970 ) was President of Mexico from 1934 to 1940 .