Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Everglades National Park' has mentioned 'Wall' in the following places:
Occurrence Sentence Text Source
Politicians who declared the Everglades uninhabitable were silenced when a four-story wall, the Herbert Hoover Dike, was built around Lake Okeechobee.
This wall effectively cut off the water source from the Everglades.
Following the wall's construction, South Florida endured a drought severe enough to cause serious wildfires in 1939.