In recent years, the Department of Housing and Urban Development has estimated that about Americans are homeless at some point during a given year.

553,000 in 2018 that's about 0.17% of the American society were homeless.

Explanation:

Homelessness has been defined as a condition of people lacking "a fixed, regular, and adequate nighttime residence" by The McKinney–Vento Homeless Assistance Act. According to the US Department of Housing and Urban Development's Annual Homeless Assessment Report, as of 2018 there were around 553,000 homeless people in the United States on a given night,or 0.17% of the population.

Homelessness became a national issue in the 1870s.