[Answer] What caused an increase in roadside attractions in the 1930s?

Step 1 : Introduction to the question "What caused an increase in roadside attractions in the 1930s?"

...In the 1930s, the U.S. highway system greatly expanded. The new roads took travelers through a lot of small towns and roadside villages. In order to entice tourists to stop and spend money in their towns, business owners started to build roadside attractions.

Step 2 : Answer to the question "What caused an increase in roadside attractions in the 1930s?"

Highways expanded:

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