It resulted in a decline in the number of immigrants to the united states from countries in the western hemisphere.
Because it placed no limits on the number of persons who could legally immigrate to the united states from countries in the western hemisphere. The Johnson act did, however, place limits on the number of persons who could immigrate to the united states from countries located in other parts of the world, and it took away the freedom of Asians to legally immigrate to the united states.
It led to an increase in the annual percentages of immigrants from northern and western Europe and a decline in the percentages of immigrants from eastern and southern Europe because it specifically allowed for the annual percentages of immigrants from western and northern Europe to be higher than those from eastern and southern Europe.