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PDF/UA (PDF/Universal Accessibility), [1] formally ISO 14289, is an International Organization for Standardization (ISO) standard for accessible PDF technology. A technical specification intended for developers implementing PDF writing and processing software, PDF/UA provides definitive terms and requirements for accessibility in PDF documents and applications. [2]
The Trail of Tears was the forced displacement of about 60,000 people of the "Five Civilized Tribes" between 1830 and 1850, and the additional thousands of Native Americans and their enslaved African Americans [3] within that were ethnically cleansed by the United States government.