The American and British governments passed several laws that helped foster the decline of indentures. The UK Parliament's Passenger Vessels Act 1803 regulated travel conditions aboard ships to make transportation more expensive, so as to hinder landlords' tenants seeking a better life. An American law passed in 1833 abolished imprisonment of debtors, which made prosecuting runaway servants more difficult, increasing the risk of indenture contract purchases. The 13th Amendment, passed in the wake of the American Civil War, made indentured servitude illegal in the United States.