Question: Why were farms and timbering operations abolished?
About the article "Great Smoky Mountains National Park", section "History".

Candidate passages:
Before the arrival of European settlers, the region was part of the homeland of the Cherokees.
Frontierspeople began settling the land in the 18th and early 19th century.
In 1830 President Andrew Jackson signed the Indian Removal Act, beginning the process that eventually resulted in the forced removal of all Indian tribes east of the Mississippi River to what is now Oklahoma.
Many of the Cherokee left, but some, led by renegade warrior Tsali, hid out in the area that is now the Great Smoky Mountains National Park.
Some of their descendants now live in the Qualla Boundary to the south of the park.
As white settlers arrived, logging grew as a major industry in the mountains, and a rail line, the Little River Railroad, was constructed in the late-19th Century to haul timber out of the remote regions of the area.
Cut-and-run-style clearcutting was destroying the natural beauty of the area, so visitors and locals banded together to raise money for preservation of the land.
The U.S. National Park Service wanted a park in the eastern United States, but did not have much money to establish one.
Though Congress had authorized the park in 1926, there was no nucleus of federally owned land around which to build a park.
John D. Rockefeller, Jr., contributed $5 million, the U.S. government added $2 million, and private citizens from Tennessee and North Carolina pitched in to assemble the land for the park, piece by piece.
Slowly, mountain homesteaders, miners, and loggers were evicted from the land.
Farms and timbering operations were abolished to establish the protected areas of the park.
Travel writer Horace Kephart, for whom Mount Kephart was named, and photographer George Masa were instrumental in fostering the development of the park.
Former Governor Ben W. Hooper of Tennessee was the principal land purchasing agent for the park, which was officially established on June 15, 1934.
During the Great Depression, the Civilian Conservation Corps, the Works Progress Administration, and other federal organizations made trails, fire watchtowers, and other infrastructure improvements to the park and Smoky Mountains.
It was also a site for filming of parts of Disney's hit 1950s TV series, "Davy Crockett, King of the Wild Frontier".
This park was designated an International Biosphere Reserve in 1976, was certified as a UNESCO World Heritage Site in 1983, and became a part of the Southern Appalachian Biosphere Reserve in 1988.
A 75th anniversary re-dedication ceremony was held on September 2, 2009.
Among those in attendance were all four US Senators, the three US Representatives whose districts include the park, the governors of both states, and Secretary of the Interior Ken Salazar.
Tennessee native, singer, and actress Dolly Parton also attended and performed.
The area is supported by rice farming, fisheries and timbering. 
The area is supported by rice farming, fisheries and timbering. 
Most traditional Basque buildings with half-timbering elements are detached farm houses (in Basque: baserriak).
Their upper floors were built with jettied box frames in close studding.
In the oldest farmsteads and, if existing, in the third floor the walls were sometimes covered with vertical weatherboards.
Big holes were left in the gable of the main façade for ventilation.
The wooden beams were painted over, mostly in dark red.
The vacancies were filled in with wattle and daub or rubble laid in a clay mortar and then plastered over with white chalk or nogged with bricks.
Although the entire supporting structure is made of wood, the timbering is only visible on the main façade, which is generally oriented to the southeast.
Although the typical Basque house is now mostly associated with half-timbering, the outer walls and the fire-walls were built in masonry (rubble stone, bricks or, ideally, ashlars) whenever it could be afforded.
Timber was a sign of poverty.
Oak-wood was cheaper than masonry : that is why, when the money was running out, the upper floor walls were mostly built timbered.
Extant baserriak with half-timbered upper-floor façades were built from the 15th to 19th centuries and are found in all Basque regions with oceanic climate, except in Zuberoa (Soule), but are concentrated in Lapurdi (Labourd).
Some medieval Basque tower houses (dorretxeak) feature an overhanged upper floor in half-timbering.
To a lesser extent timbered houses are also found in villages and towns as row houses, as the photo from the Uztaritz village shows.
Currently, it has again become popular to build houses resembling old Basque farmsteads, with more or less respect for the principles of traditional half-timbered building. 
Houses in the road were first leased between 1910 and 1917.
Most of the houses were designed by the architect N. W. Harrison.
No.
11 was designed with half-timbering and stone-battered buttresses by Frank Mountain.