sentences:  In the early twentieth century the use of a wheelchair at home or out in public was a daunting prospect as no public transportation system accommodated wheelchairs and most public buildings including schools, were inaccessible to those with disabilities.Many children left disabled by polio were forced to attend separate institutions for "crippled children" or had to be carried up and down stairs.As people who had been paralyzed by polio matured, they began to demand the right to participate in the mainstream of society.