Answer:
The effects of the oil boom in Kilgore, Texas helped relieve the effects of the Depression in the area. Oil discovery on the region led to rapid industrialization and more revenue which helped in the development of other sectors such as transportation, education and other social amenities.
The set back was mainly pollution. The industrial processing of the oil led to air pollution from the industries due to gas flaring. Water pollution was also common and the waters in the area are regarded as one of the most polluted in the United States. This was because the several sea ports built in the area for easy transportation of the oil had some oil seeping out into the water during loading and offloading. The land which had oil with neighboring water bodies weren't spared too.
Your answer is Enslaved Africans.
Hope I helped;)
Thomas Jefferson was the author of the Declaration of independence.
Why they were declaring independence. Basically it was talking about their mistreatment under the British Flag. It was also to tell the King that they were no longer British subjects.
