meaning of sentence

[kohyoongliat]

Line dancing evolved from Contra dances that were popular in the US in the early 19th century. It represents America's frontier past. The earlier settlers worked hard all day and night and relaxed by dancing. As the settlers came from all over the world, different dance styles emerged.

Could someone please explain the meaning of the sentence in bold?

[ian2]

Line dancing evolved from Contra dances that were popular in the US in the early 19th century. It represents America's frontier past. The earlier settlers worked hard all day and night and relaxed by dancing. As the settlers came from all over the world, different dance styles emerged.

Could someone please explain the meaning of the sentence in bold?

I think the sentence is self-explanatory, as the following sentences indicate that it talks about Americans moving from the East Coast to the West coast, creating new frontiers along the way. To have a comprehensive picture of American frontier, you can visit the following website of Wikipedia:

Frontier - Wikipedia, the free encyclopedia

[angliholic]

Line dancing evolved from Contra dances that were popular in the US in the early 19th century. It (=Line dancing) represents (is a symbol of) America's (west) frontier (in the) past. The earlier settlers worked hard all day and night and relaxed by dancing. As the settlers came from all over the world, different dance styles emerged.

Could someone please explain the meaning of the sentence in bold?