In the late nineteenth century, political "machines" and political bosses in cities owed their existence to Group of answer choices the influx of millions of immigrants and the lack of Democratic and Republican organization in cities. the influx of millions of immigrants. the rapid growth of urban America. the lack of Democratic and Republican organization in cities. the rapid growth of urban America and the influx of millions of immigrants.

Correct

The rapid growth of urban America and the influx of millions of immigrants.

Explanation:

During the late nineteenth century, there was a great control of the political machines by few individuals. They helped in determining the direction an election would swing to through their political networks and contacts.

These political bosses were able to control such political machinery as a result of the rapid growth of the urban America. Also, the influx of immigrants from China, Europe and other parts of the world helped towards  this.