We could say that the growth of the cotton industry and the expansion of slavery into new states such as Alabama and Mississippi this ended hope's for a very gradual end to slavery so its opponents had the necessity to stop it from spreading to the new lands of the Louisiana Purchase. However, by the year of 1818 the northern states had a majority of growing immigrants in the House.
President Andrew Johnson believed that the rights of the Emancipation Proclamation and its guarantees were enough to secure the civil rights of the African-Americans.
Because of that President Johnson believed that a new bill was completely unnecessary. But this was not really an isolated case. The Freedman's Bureau was facing position left and right, in their mission which included providing financial help, food and shelter to freed African-Americans and poor whites as well as resettling former slaves on the confiscated land.