The National Park Service preserves unimpaired the natural and cultural resources and values of the National Park System for the enjoyment, education, and inspiration of this and future generations.The Park Ser
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The NPS-groups are removed using 2-mercaptoethanol/DBU/DMF. The products are then cleaved using 80:18:2 CH2Cl2/TFA/iPr3SiH directly into individual pre-tared 4 mL vials. Data handling is facilitated by direct data acquisition from the weighing balance into a spreadsheet program. In this way,...
As the need for labor grew, the planters turned to a race-based system of lifelong, hereditary enslavement. Many African Americans who had earlier lived as free people—through acceptance of Christianity, the free status of one or both parents, or their place of birth—lost their rights. Afte...
system. Passage of the Timber Culture Act in 1873, a sequel to the 1862 Homestead Act, granted settlers 160-acre plots if they would cultivate trees on one-fourth of the land for 10 years. The act revealed the growing public concern with conserving forest resources and provided a boost to...
that Mather work to improve the system by joining the department in Washington,D.C.Two years later, through the efforts of Mather and his assistant, Horace Albright,Congresspassed what was dubbed the “Organic Act,” which authorized the formation of the NPS. Mather was named its first ...
In the summer of 1932, Congress denied military veterans an immediate bonus payment for participation in WWI. "Bonus Marchers" numbering more than 20,000 remained in Washington after this decision, demonstrating discontent so much that President Herbert Hoover called for the Army's help. Hundreds ...
out went cotton in payment. To close the port—and also capture the city—it was necessary first to seize Fort Sumter, now repaired and armed with some 95 guns. After an earlier Army attempt had failed on James Island, the job fell to the U.S. Navy, and Rear Adm. Samuel F. Du Po...