The proven method for saving the lives of innocent Americans is not disarming them. The proven method for saving the lives of innocent Americans is to arrest, prosecute, convict and jail criminal offenders, especially armed career criminals illegally using guns. This is the way to reduce gun violence.
In the 1940s, traveling for an African was a complicated process. All Africans over the age of sixteen were compelled to carry 'Native passes' issued by the Native Affairs Department and were required to show that pass to any white policeman, civil servant, or employer. Failure to do so could mean arrest, trial, a jail sentence or fine.
Either the opponents of slavery will arrest the further spread of it and place it where the public mind shall rest in the belief that it is in course of ultimate extinction, or its advocates will push it forward, till it shall become alike lawful in all the States - old as well as new - North as well as South.