Original sentence: However, in their desperation to assume complete white hegemony, conservative Democrats in Louisiana classified Creoles with freedmen and by the end of the 19th century had disfranchised most blacks and many poor whites under rules designed to suppress black voting
Edited sentence: However, in their desperation to assume complete white hegemony, conservative Democrats in Louisiana classified Creoles with freedmen and by the end of the 19th century had disfranchised most blacks and many poor whites under rules designed to suppress black voting (though federal law said all black men had the vote from 1870, women from 1920)