Final answer:
PL 115-71 does not correspond with the historical information provided about legislation for disability rights and education. Therefore, it's not possible to determine what the law was intended to improve. Details on the Rehabilitation Act, IDEA, and ADA have been outlined instead, as they are relevant to the subject.
Step-by-step explanation:
The legislation referred to as PL 115-71 is not clearly identified in the historical references provided. The information given revolves around the significant milestones in the history of education for individuals with disabilities and does not specify the context for PL 115-71. Therefore, it's not possible to provide an accurate answer regarding what PL 115-71 was signed to improve without additional information on the specific law. However, the history outlined pertains to acts such as the Rehabilitation Act of 1973, the Education for All Handicapped Children Act of 1975, the Individuals with Disabilities Education Act (IDEA), and the Americans with Disabilities Act (ADA).
These acts have laid the foundation for access to education for students with disabilities, setting precedents for universal access and ensuring that they receive the necessary educational and support services. The IDEA, for instance, provides for individual education plans that cater to the specific needs of students with disabilities. Similarly, the ADA enforces broader non-discrimination policies across various sectors including education.
Given the lack of clear information on PL 115-71, it's crucial to seek more details or consider that the question may contain a possible typographical error regarding the law's identification number or details.